  | |
| Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
|---|---|
| Constellation | Corona Australis |
| Right ascension | 18h 28m 27.11405s [1] |
| Declination | −38° 59′ 44.4102″ [1] |
| Apparent magnitude (V) | 5.62±0.01 [2] |
| Characteristics | |
| Spectral type | A2m A2-F0 [3] or A3 III [4] |
| B−V color index | +0.13 [5] |
| Astrometry | |
| Radial velocity (Rv) | −21.3±1.2 [6] km/s |
| Proper motion (μ) |
RA: +0.096
mas/
yr
[1] Dec.: −41.093 mas/ yr [1] |
| Parallax (π) | 8.3424 ± 0.0673 mas [1] |
| Distance | 391 ± 3
ly (119.9 ± 1.0 pc) |
| Absolute magnitude (MV) | +0.13 [7] |
| Details | |
| Mass | 2.09+0.39 −0.25 [8] M☉ |
| Radius | 3.72±0.12 [9] R☉ |
| Luminosity | 60.7+1.0 −1.1 [1] L☉ |
| Surface gravity (log g) | 3.64 [10] cgs |
| Temperature | 8,437±164 [8] K |
| Metallicity [Fe/H] | −0.01 [11] dex |
| Rotational velocity (v sin i) | 22.6±0.3 [12] km/s |
| Age | 585+67 −66 [1] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 169853, also known as HR 6910 or rarely 9 G. Coronae Australis, is a solitary star [15] located in the southern constellation Corona Australis. It is faintly visible to the naked eye as a white-hued point of light with an apparent magnitude of 5.62. [2] Gaia DR3 parallax measurements imply a distance of 391 light years, [1] and it is currently approaching the Solar System with a heliocentric radial velocity of −21.3 km/s. [6] At its current distance, HD 169853's brightness is diminished by 0.36 magnitudes due to extinction from interstellar dust [16] and it has an absolute magnitude of +0.13. [7]
HD 169853 has a stellar classification of A2mA2-F0, [3] indicating that it is an Am star with the calcium H lines of an A2 star and the metallic lines of an F0 star. Abt and Morell (1995) give a class of A3 III, [4] indicating that the object is instead an evolved A-type giant star with no chemical peculiarities. A paper published in late 1987 found that HD 169853 had an overabundance of silicon, manganese, strontium, and barium. [17]
The object has 2.09 times the mass of the Sun [8] and a slightly enlarged radius of 3.72 R☉. [9] It radiates 60.7 times the luminosity of the Sun [1] from its photosphere at an effective temperature of 8,437 K. [8] It has a near solar metallicity at (Fe/H) = −0.01 [11] and it is estimated to be 585 million years old, having completed 80% of its main sequence lifetime. [1] Like many chemically peculiar stars, HD 169853 rotates rather slowly, having a projected rotational velocity of 22.6 km/s. [12]
References
- ^ a b c d e f g h i 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.
- ^ a b Houk, N. (1982). Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Declinations −40° to −26°. Vol. 3. Bibcode: 1982mcts.book.....H.
- ^ a b Abt, Helmut A.; Morrell, Nidia I. (July 1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". The Astrophysical Journal Supplement Series. 99: 135. Bibcode: 1995ApJS...99..135A. doi: 10.1086/192182. ISSN 0067-0049.
- ^ Corben, P. M. (April 1971). "Photoelectric Magnitudes and Colours for Bright Southern Stars". Monthly Notes of the Astronomical Society of South Africa. 30 (4): 37. Bibcode: 1971MNSSA..30...37C. ISSN 0024-8266.
- ^ 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 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 Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv: 1905.10694. Bibcode: 2019AJ....158..138S. doi: 10.3847/1538-3881/ab3467. eISSN 1538-3881. hdl: 1721.1/124721. S2CID 166227927.
- ^ a b Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (October 2004). "The angular sizes of dwarf stars and subgiants". 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.
- ^ Anders, F.; et al. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy & Astrophysics. 628: A94. arXiv: 1904.11302. Bibcode: 2019A&A...628A..94A. doi: 10.1051/0004-6361/201935765. eISSN 1432-0746. ISSN 0004-6361. S2CID 131780028.
- ^ a b Gontcharov, G. A. (December 2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters. 38 (12): 771–782. arXiv: 1606.08814. Bibcode: 2012AstL...38..771G. doi: 10.1134/S1063773712120031. eISSN 1562-6873. ISSN 1063-7737. S2CID 118345778.
- ^ a b Díaz, C. G.; González, J. F.; Levato, H.; Grosso, M. (July 2011). "Accurate stellar rotational velocities using the Fourier transform of the cross correlation maximum". Astronomy & Astrophysics. 531: A143. arXiv: 1012.4858. Bibcode: 2011A&A...531A.143D. doi: 10.1051/0004-6361/201016386. eISSN 1432-0746. ISSN 0004-6361. S2CID 119286673.
- ^ 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.
- ^ "HD 169853". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved May 17, 2023.
- ^ Eggleton, P. P.; Tokovinin, A. A. (11 September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv: 0806.2878. Bibcode: 2008MNRAS.389..869E. doi: 10.1111/j.1365-2966.2008.13596.x. eISSN 1365-2966. ISSN 0035-8711. S2CID 14878976.
- ^ 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.
- ^ Lodén, L. O.; Sundman, A. (December 1987). "Experiments with CP stars". Journal of Astrophysics and Astronomy. 8 (4): 351–367. Bibcode: 1987JApA....8..351L. doi: 10.1007/BF02714899. eISSN 0973-7758. ISSN 0250-6335. S2CID 123172433.
| |
| Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
|---|---|
| Constellation | Corona Australis |
| Right ascension | 18h 28m 27.11405s [1] |
| Declination | −38° 59′ 44.4102″ [1] |
| Apparent magnitude (V) | 5.62±0.01 [2] |
| Characteristics | |
| Spectral type | A2m A2-F0 [3] or A3 III [4] |
| B−V color index | +0.13 [5] |
| Astrometry | |
| Radial velocity (Rv) | −21.3±1.2 [6] km/s |
| Proper motion (μ) |
RA: +0.096
mas/
yr
[1] Dec.: −41.093 mas/ yr [1] |
| Parallax (π) | 8.3424 ± 0.0673 mas [1] |
| Distance | 391 ± 3
ly (119.9 ± 1.0 pc) |
| Absolute magnitude (MV) | +0.13 [7] |
| Details | |
| Mass | 2.09+0.39 −0.25 [8] M☉ |
| Radius | 3.72±0.12 [9] R☉ |
| Luminosity | 60.7+1.0 −1.1 [1] L☉ |
| Surface gravity (log g) | 3.64 [10] cgs |
| Temperature | 8,437±164 [8] K |
| Metallicity [Fe/H] | −0.01 [11] dex |
| Rotational velocity (v sin i) | 22.6±0.3 [12] km/s |
| Age | 585+67 −66 [1] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 169853, also known as HR 6910 or rarely 9 G. Coronae Australis, is a solitary star [15] located in the southern constellation Corona Australis. It is faintly visible to the naked eye as a white-hued point of light with an apparent magnitude of 5.62. [2] Gaia DR3 parallax measurements imply a distance of 391 light years, [1] and it is currently approaching the Solar System with a heliocentric radial velocity of −21.3 km/s. [6] At its current distance, HD 169853's brightness is diminished by 0.36 magnitudes due to extinction from interstellar dust [16] and it has an absolute magnitude of +0.13. [7]
HD 169853 has a stellar classification of A2mA2-F0, [3] indicating that it is an Am star with the calcium H lines of an A2 star and the metallic lines of an F0 star. Abt and Morell (1995) give a class of A3 III, [4] indicating that the object is instead an evolved A-type giant star with no chemical peculiarities. A paper published in late 1987 found that HD 169853 had an overabundance of silicon, manganese, strontium, and barium. [17]
The object has 2.09 times the mass of the Sun [8] and a slightly enlarged radius of 3.72 R☉. [9] It radiates 60.7 times the luminosity of the Sun [1] from its photosphere at an effective temperature of 8,437 K. [8] It has a near solar metallicity at (Fe/H) = −0.01 [11] and it is estimated to be 585 million years old, having completed 80% of its main sequence lifetime. [1] Like many chemically peculiar stars, HD 169853 rotates rather slowly, having a projected rotational velocity of 22.6 km/s. [12]
References
- ^ a b c d e f g h i 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.
- ^ a b Houk, N. (1982). Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Declinations −40° to −26°. Vol. 3. Bibcode: 1982mcts.book.....H.
- ^ a b Abt, Helmut A.; Morrell, Nidia I. (July 1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". The Astrophysical Journal Supplement Series. 99: 135. Bibcode: 1995ApJS...99..135A. doi: 10.1086/192182. ISSN 0067-0049.
- ^ Corben, P. M. (April 1971). "Photoelectric Magnitudes and Colours for Bright Southern Stars". Monthly Notes of the Astronomical Society of South Africa. 30 (4): 37. Bibcode: 1971MNSSA..30...37C. ISSN 0024-8266.
- ^ 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 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 Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv: 1905.10694. Bibcode: 2019AJ....158..138S. doi: 10.3847/1538-3881/ab3467. eISSN 1538-3881. hdl: 1721.1/124721. S2CID 166227927.
- ^ a b Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (October 2004). "The angular sizes of dwarf stars and subgiants". 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.
- ^ Anders, F.; et al. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy & Astrophysics. 628: A94. arXiv: 1904.11302. Bibcode: 2019A&A...628A..94A. doi: 10.1051/0004-6361/201935765. eISSN 1432-0746. ISSN 0004-6361. S2CID 131780028.
- ^ a b Gontcharov, G. A. (December 2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters. 38 (12): 771–782. arXiv: 1606.08814. Bibcode: 2012AstL...38..771G. doi: 10.1134/S1063773712120031. eISSN 1562-6873. ISSN 1063-7737. S2CID 118345778.
- ^ a b Díaz, C. G.; González, J. F.; Levato, H.; Grosso, M. (July 2011). "Accurate stellar rotational velocities using the Fourier transform of the cross correlation maximum". Astronomy & Astrophysics. 531: A143. arXiv: 1012.4858. Bibcode: 2011A&A...531A.143D. doi: 10.1051/0004-6361/201016386. eISSN 1432-0746. ISSN 0004-6361. S2CID 119286673.
- ^ 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.
- ^ "HD 169853". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved May 17, 2023.
- ^ Eggleton, P. P.; Tokovinin, A. A. (11 September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv: 0806.2878. Bibcode: 2008MNRAS.389..869E. doi: 10.1111/j.1365-2966.2008.13596.x. eISSN 1365-2966. ISSN 0035-8711. S2CID 14878976.
- ^ 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.
- ^ Lodén, L. O.; Sundman, A. (December 1987). "Experiments with CP stars". Journal of Astrophysics and Astronomy. 8 (4): 351–367. Bibcode: 1987JApA....8..351L. doi: 10.1007/BF02714899. eISSN 0973-7758. ISSN 0250-6335. S2CID 123172433.