  | |
| Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
|---|---|
| Constellation | Corona Australis |
| Right ascension | 18h 13m 12.69843s [1] |
| Declination | −41° 20′ 09.9972″ [1] |
| Apparent magnitude (V) | 5.46 [2] (5.46 - 5.51) [3] |
| Characteristics | |
| Spectral type | B2 III [4] or B1.5 IIIp [5] |
| B−V color index | −0.17 [6] |
| Variable type | SX Arietis [7] |
| Astrometry | |
| Radial velocity (Rv) | −15.3±2.8 [8] km/s |
| Proper motion (μ) |
RA: −2.050
mas/
yr
[1] Dec.: −6.210 mas/ yr [1] |
| Parallax (π) | 1.7423 ± 0.0977 mas [1] |
| Distance | 1,900 ± 100
ly (570 ± 30 pc) |
| Absolute magnitude (MV) | −6.44 [9] or −2.26 [10] |
| Details | |
| Mass | 7.35±0.48 [11] M☉ |
| Radius | 12.6±0.7 [12] R☉ |
| Luminosity (bolometric) | 4,181 [11] L☉ |
| Surface gravity (log g) | 3.52+0.33 −0.14 [1] cgs |
| Temperature | 17,061+1,474 −1,357 [13] K |
| Rotational velocity (v sin i) | 212±9 [14] km/s |
| Age | 31.6±5.1 [15] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
V692 Coronae Australis (HD 166596; HR 6804; 3 G. CrA), or simply V692 CrA, is a whitish-blue hued variable star located in the southern constellation Corona Australis. It has a maximum apparent magnitude of 5.46, [2] making it faintly visible to the naked eye. The object is located relatively far at a distance of approximately 1,900 light years based on Gaia DR3 parallax measurements, [1] but it is approaching the Solar System with a fairly constrained heliocentric radial velocity of −15.3 km/s. [8] At its current distance, V692 CrA's brightness is heavily diminished by 0.46 magnitudes due to extinction due to interstellar dust. [18] Its absolute magnitude depends on the source: Westin (1985) gave a value of −6.44 [9] while the extended Hipparcos catalogue gave a value of −2.26. [10]
Astronomers Carlos and Mercedes Jaschek along with a colleague listed HD 166596 as a Be star in 1964. [20] However, its status as an Ap star was not observed until 1979 by astronomers N. Vogt and A.M Faundez. [21] A year later, HD 166596 was observed to be variable and it had a period of 1.67 days. [22] In 1981, its variability was confirmed and it was given the variable star designation V692 Coronae Australis—the 692nd variable star in Corona Australis. [23] The star might have a shorter period of 49.8 hours. [7]
V692 CrA has a stellar classification of B2 III [4] or B1.5 IIIp, [5] both indicating that it is a slightly evolved B-type giant star. The second classification indicates that V692 CrA has peculiarities in its spectrum. It has 7.35 times the mass of the Sun [11] and 12.6 times the Sun's radius. [12] It radiates at a bolometric luminosity 4,181 times that of the Sun [11] from its photosphere at an effective temperature of 17,061 K. [13] V692 CrA is estimated to be 31.6 million years old [15] and it spins rapidly with a projected rotational velocity of 212 km/s. [14]
References
- ^ a b c d e f Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211. Bibcode: 2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode: 2000A&A...355L..27H. ISSN 0004-6361. S2CID 17128864.
- ^ "VSX : Detail for V0692 CrA". www.aavso.org.
- ^ a b Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars: Declinations −53° to −40°. Vol. 2. Bibcode: 1978mcts.book.....H.
- ^ a b Rountree, Janet; Sonneborn, George (March 1991). "Criteria for the spectral classification of B stars in the ultraviolet". The Astrophysical Journal. 369: 515. Bibcode: 1991ApJ...369..515R. doi: 10.1086/169781. eISSN 1538-4357. ISSN 0004-637X. S2CID 118640556.
- ^ Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode: 1966CoLPL...4...99J. S2CID 118307502.
- ^ a b Samus’, N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (January 2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports. 61 (1): 80–88. Bibcode: 2017ARep...61...80S. doi: 10.1134/S1063772917010085. eISSN 1562-6881. ISSN 1063-7729. S2CID 125853869.
- ^ a b Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv: 1606.08053. Bibcode: 2006AstL...32..759G. doi: 10.1134/S1063773706110065. eISSN 1562-6873. ISSN 1063-7737. S2CID 119231169.
- ^ a b Westin, T. N. G. (April 1985). "The local system of early type stars. Spatial extent and kinematics". Astronomy and Astrophysics Supplement Series. 60: 99–134. Bibcode: 1985A&AS...60...99W. ISSN 0365-0138. S2CID 119020376.
- ^ a b Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv: 1108.4971. Bibcode: 2012AstL...38..331A. doi: 10.1134/S1063773712050015. eISSN 1562-6873. ISSN 1063-7737. S2CID 119257644.
- ^ a b c d Hohle, M.M.; Neuhäuser, R.; Schutz, B.F. (April 2010). "Masses and luminosities of O- and B-type stars and red supergiants". Astronomische Nachrichten. 331 (4): 349–360. arXiv: 1003.2335. Bibcode: 2010AN....331..349H. doi: 10.1002/asna.200911355. eISSN 1521-3994. ISSN 0004-6337. S2CID 111387483.
- ^ a b Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (October 2004). "The angular sizes of dwarf stars and subgiants. Surface brightness relations calibrated by interferometry". Astronomy & Astrophysics. 426 (1): 297–307. arXiv: astro-ph/0404180. Bibcode: 2004A&A...426..297K. doi: 10.1051/0004-6361:20035930. eISSN 1432-0746. ISSN 0004-6361. S2CID 6077801.
- ^ a b Gulati, R. K.; Malagnini, M. L.; Morossi, C. (October 1989). "Empirical temperature calibrations for early-type stars". Astronomy and Astrophysics Supplement Series. 80: 73–88. Bibcode: 1989A&AS...80...73G. ISSN 0365-0138. S2CID 115777506.
- ^ a b Brown, A. G. A.; Verschueren, W. (March 1997). "High S/N Echelle spectroscopy in young stellar groups. II. Rotational velocities of early-type stars in SCO OB2". Astronomy & Astrophysics. 319: 811–838. arXiv: astro-ph/9608089. Bibcode: 1997A&A...319..811B. ISSN 0004-6361. S2CID 118925453.
- ^ a b Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (October 12, 2010). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society. 410 (1). Oxford University Press (OUP): 190–200. arXiv: 1007.4883. Bibcode: 2011MNRAS.410..190T. doi: 10.1111/j.1365-2966.2010.17434.x. ISSN 0035-8711. S2CID 118629873.
- ^ Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino. 1. Bibcode: 1879RNAO....1.....G.
- ^ "V* V692 CrA". SIMBAD. Centre de données astronomiques de Strasbourg.
- ^ Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017). "Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars". Monthly Notices of the Royal Astronomical Society. 472 (4): 3805–3820. arXiv: 1709.01160. Bibcode: 2017MNRAS.472.3805G. doi: 10.1093/mnras/stx2219. eISSN 1365-2966. ISSN 0035-8711. S2CID 118879856.
- ^ EAS (1997). "The HIPPARCOS and TYCHO catalogues". Astrometric and Photometric Star Catalogues Derived from the ESA Hipparcos Space Astrometry Mission. ESA SP Series. 1200. Noordwijk, Netherlands: ESA Publications Division. Bibcode: 1997HIP...C......0E. ISBN 9290923997. Retrieved 15 October 2022.
- ^ Jaschek, C.; Jaschek, M.; Kucewicz, B. (1964). "A Survey of Southern Be Stars". Zeitschrift für Astrophysik. 59: 108. Bibcode: 1964ZA.....59..108J. ISSN 0372-8331. S2CID 117724232.
- ^ Vogt, N.; Faundez, A. M. (1 June 1979). "Photoelectric observations of peculiar A and related stars I: Strömgren photometry of 341 Ap stars". Astronomy and Astrophysics Supplement Series. 36: 477–484. Bibcode: 1979A&AS...36..477V. ISSN 0365-0138.
- ^ Renson, P.; Manfroid, J. (March 1980). "Nouvelle Recherche de Periodes d'etoiles Ap Observees a l'ESO-IV". Information Bulletin on Variable Stars. 1755: 1. Bibcode: 1980IBVS.1755....1R. ISSN 0374-0676.
- ^ Kholopov, P. N.; Samus', N. N.; Kukarkina, N. P.; Medvedeva, G. I.; Perova, N. B. (November 1981). "66th Name-List of Variable Stars". Information Bulletin on Variable Stars. 2042: 1. Bibcode: 1981IBVS.2042....1K. ISSN 0374-0676.
| |
| Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
|---|---|
| Constellation | Corona Australis |
| Right ascension | 18h 13m 12.69843s [1] |
| Declination | −41° 20′ 09.9972″ [1] |
| Apparent magnitude (V) | 5.46 [2] (5.46 - 5.51) [3] |
| Characteristics | |
| Spectral type | B2 III [4] or B1.5 IIIp [5] |
| B−V color index | −0.17 [6] |
| Variable type | SX Arietis [7] |
| Astrometry | |
| Radial velocity (Rv) | −15.3±2.8 [8] km/s |
| Proper motion (μ) |
RA: −2.050
mas/
yr
[1] Dec.: −6.210 mas/ yr [1] |
| Parallax (π) | 1.7423 ± 0.0977 mas [1] |
| Distance | 1,900 ± 100
ly (570 ± 30 pc) |
| Absolute magnitude (MV) | −6.44 [9] or −2.26 [10] |
| Details | |
| Mass | 7.35±0.48 [11] M☉ |
| Radius | 12.6±0.7 [12] R☉ |
| Luminosity (bolometric) | 4,181 [11] L☉ |
| Surface gravity (log g) | 3.52+0.33 −0.14 [1] cgs |
| Temperature | 17,061+1,474 −1,357 [13] K |
| Rotational velocity (v sin i) | 212±9 [14] km/s |
| Age | 31.6±5.1 [15] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
V692 Coronae Australis (HD 166596; HR 6804; 3 G. CrA), or simply V692 CrA, is a whitish-blue hued variable star located in the southern constellation Corona Australis. It has a maximum apparent magnitude of 5.46, [2] making it faintly visible to the naked eye. The object is located relatively far at a distance of approximately 1,900 light years based on Gaia DR3 parallax measurements, [1] but it is approaching the Solar System with a fairly constrained heliocentric radial velocity of −15.3 km/s. [8] At its current distance, V692 CrA's brightness is heavily diminished by 0.46 magnitudes due to extinction due to interstellar dust. [18] Its absolute magnitude depends on the source: Westin (1985) gave a value of −6.44 [9] while the extended Hipparcos catalogue gave a value of −2.26. [10]
Astronomers Carlos and Mercedes Jaschek along with a colleague listed HD 166596 as a Be star in 1964. [20] However, its status as an Ap star was not observed until 1979 by astronomers N. Vogt and A.M Faundez. [21] A year later, HD 166596 was observed to be variable and it had a period of 1.67 days. [22] In 1981, its variability was confirmed and it was given the variable star designation V692 Coronae Australis—the 692nd variable star in Corona Australis. [23] The star might have a shorter period of 49.8 hours. [7]
V692 CrA has a stellar classification of B2 III [4] or B1.5 IIIp, [5] both indicating that it is a slightly evolved B-type giant star. The second classification indicates that V692 CrA has peculiarities in its spectrum. It has 7.35 times the mass of the Sun [11] and 12.6 times the Sun's radius. [12] It radiates at a bolometric luminosity 4,181 times that of the Sun [11] from its photosphere at an effective temperature of 17,061 K. [13] V692 CrA is estimated to be 31.6 million years old [15] and it spins rapidly with a projected rotational velocity of 212 km/s. [14]
References
- ^ a b c d e f Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211. Bibcode: 2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode: 2000A&A...355L..27H. ISSN 0004-6361. S2CID 17128864.
- ^ "VSX : Detail for V0692 CrA". www.aavso.org.
- ^ a b Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars: Declinations −53° to −40°. Vol. 2. Bibcode: 1978mcts.book.....H.
- ^ a b Rountree, Janet; Sonneborn, George (March 1991). "Criteria for the spectral classification of B stars in the ultraviolet". The Astrophysical Journal. 369: 515. Bibcode: 1991ApJ...369..515R. doi: 10.1086/169781. eISSN 1538-4357. ISSN 0004-637X. S2CID 118640556.
- ^ Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode: 1966CoLPL...4...99J. S2CID 118307502.
- ^ a b Samus’, N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (January 2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports. 61 (1): 80–88. Bibcode: 2017ARep...61...80S. doi: 10.1134/S1063772917010085. eISSN 1562-6881. ISSN 1063-7729. S2CID 125853869.
- ^ a b Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv: 1606.08053. Bibcode: 2006AstL...32..759G. doi: 10.1134/S1063773706110065. eISSN 1562-6873. ISSN 1063-7737. S2CID 119231169.
- ^ a b Westin, T. N. G. (April 1985). "The local system of early type stars. Spatial extent and kinematics". Astronomy and Astrophysics Supplement Series. 60: 99–134. Bibcode: 1985A&AS...60...99W. ISSN 0365-0138. S2CID 119020376.
- ^ a b Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv: 1108.4971. Bibcode: 2012AstL...38..331A. doi: 10.1134/S1063773712050015. eISSN 1562-6873. ISSN 1063-7737. S2CID 119257644.
- ^ a b c d Hohle, M.M.; Neuhäuser, R.; Schutz, B.F. (April 2010). "Masses and luminosities of O- and B-type stars and red supergiants". Astronomische Nachrichten. 331 (4): 349–360. arXiv: 1003.2335. Bibcode: 2010AN....331..349H. doi: 10.1002/asna.200911355. eISSN 1521-3994. ISSN 0004-6337. S2CID 111387483.
- ^ a b Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (October 2004). "The angular sizes of dwarf stars and subgiants. Surface brightness relations calibrated by interferometry". Astronomy & Astrophysics. 426 (1): 297–307. arXiv: astro-ph/0404180. Bibcode: 2004A&A...426..297K. doi: 10.1051/0004-6361:20035930. eISSN 1432-0746. ISSN 0004-6361. S2CID 6077801.
- ^ a b Gulati, R. K.; Malagnini, M. L.; Morossi, C. (October 1989). "Empirical temperature calibrations for early-type stars". Astronomy and Astrophysics Supplement Series. 80: 73–88. Bibcode: 1989A&AS...80...73G. ISSN 0365-0138. S2CID 115777506.
- ^ a b Brown, A. G. A.; Verschueren, W. (March 1997). "High S/N Echelle spectroscopy in young stellar groups. II. Rotational velocities of early-type stars in SCO OB2". Astronomy & Astrophysics. 319: 811–838. arXiv: astro-ph/9608089. Bibcode: 1997A&A...319..811B. ISSN 0004-6361. S2CID 118925453.
- ^ a b Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (October 12, 2010). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society. 410 (1). Oxford University Press (OUP): 190–200. arXiv: 1007.4883. Bibcode: 2011MNRAS.410..190T. doi: 10.1111/j.1365-2966.2010.17434.x. ISSN 0035-8711. S2CID 118629873.
- ^ Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino. 1. Bibcode: 1879RNAO....1.....G.
- ^ "V* V692 CrA". SIMBAD. Centre de données astronomiques de Strasbourg.
- ^ Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017). "Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars". Monthly Notices of the Royal Astronomical Society. 472 (4): 3805–3820. arXiv: 1709.01160. Bibcode: 2017MNRAS.472.3805G. doi: 10.1093/mnras/stx2219. eISSN 1365-2966. ISSN 0035-8711. S2CID 118879856.
- ^ EAS (1997). "The HIPPARCOS and TYCHO catalogues". Astrometric and Photometric Star Catalogues Derived from the ESA Hipparcos Space Astrometry Mission. ESA SP Series. 1200. Noordwijk, Netherlands: ESA Publications Division. Bibcode: 1997HIP...C......0E. ISBN 9290923997. Retrieved 15 October 2022.
- ^ Jaschek, C.; Jaschek, M.; Kucewicz, B. (1964). "A Survey of Southern Be Stars". Zeitschrift für Astrophysik. 59: 108. Bibcode: 1964ZA.....59..108J. ISSN 0372-8331. S2CID 117724232.
- ^ Vogt, N.; Faundez, A. M. (1 June 1979). "Photoelectric observations of peculiar A and related stars I: Strömgren photometry of 341 Ap stars". Astronomy and Astrophysics Supplement Series. 36: 477–484. Bibcode: 1979A&AS...36..477V. ISSN 0365-0138.
- ^ Renson, P.; Manfroid, J. (March 1980). "Nouvelle Recherche de Periodes d'etoiles Ap Observees a l'ESO-IV". Information Bulletin on Variable Stars. 1755: 1. Bibcode: 1980IBVS.1755....1R. ISSN 0374-0676.
- ^ Kholopov, P. N.; Samus', N. N.; Kukarkina, N. P.; Medvedeva, G. I.; Perova, N. B. (November 1981). "66th Name-List of Variable Stars". Information Bulletin on Variable Stars. 2042: 1. Bibcode: 1981IBVS.2042....1K. ISSN 0374-0676.