| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Lyra |
| Right ascension | 18h 36m 37.34437s [1] |
| Declination | 33° 28′ 08.5352″ [1] |
| Apparent magnitude (V) | 5.41 [2] + 10.7 [3] |
| Characteristics | |
| Spectral type | B8IIpHgMn [4] |
| U−B color index | −0.509 [2] |
| B−V color index | −0.101±0.003 [2] |
| Astrometry | |
| A | |
| Radial velocity (Rv) | −32.5±0.8 [5] km/s |
| Proper motion (μ) |
RA: −7.966
[1]
mas/
yr Dec.: +0.690 [1] mas/ yr |
| Parallax (π) | 6.0990 ± 0.0893 mas [1] |
| Distance | 535 ± 8
ly (164 ± 2 pc) |
| Absolute magnitude (MV) | −0.53 [2] |
| B | |
| Proper motion (μ) |
RA: −7.403
[6]
mas/
yr Dec.: +0.479 [6] mas/ yr |
| Parallax (π) | 6.2391 ± 0.0221 mas [6] |
| Distance | 523 ± 2
ly (160.3 ± 0.6 pc) |
| Orbit [7] | |
| Period (P) | 1675 d |
| Semi-major axis (a) | ≥71.6×108 km |
| Eccentricity (e) | 0.16 |
| Periastron epoch (T) | 2,420,438.5 JD |
|
Argument of periastron (ω) (secondary) | 120° |
|
Semi-amplitude (K1) (primary) | 3.2 km/s |
| Details | |
| A | |
| Mass | 3.65±0.50 [8] M☉ |
| Luminosity | 262.17 [2] L☉ |
| Surface gravity (log g) | 3.90 [9] cgs |
| Temperature | 14,500 [9] K |
| Metallicity [Fe/H] | −0.25 [2] dex |
| Rotational velocity (v sin i) | 34 [9] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 172044 is a triple star [11] system in the northern constellation of Lyra. It has a blue-white hue and is visible to the naked eye with an apparent visual magnitude of 5.41. [2] The distance to the primary component is approximately 535 light years based on parallax. [1] It is drifting closer with a radial velocity of −32.5 km/s, and is predicted to come as near as 77.3 light-years to the Sun some 4.5 million years from now. [2]
The dual nature of the primary star, component A, was announced in 1973 by H. A. Abt and M. A. Snowden. It is a single-lined spectroscopic binary with a preliminary orbital period of 4.59 years and an eccentricity (ovalness) of 0.16. [7] The visible component is a B-type bright giant with a stellar classification of B8IIpHgMn, [4] where the suffix notation indicates it is a chemically peculiar mercury-manganese star. [9]
Component B is a magnitude 9.40 companion of an unknown spectral type. [12] It was first reported by F. G. W. Struve in 1830. As of 2016, it has an angular separation of 7.2 arcseconds along a position angle of 204° from the brighter component. [3]
References
- ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv: 1804.09365. Bibcode: 2018A&A...616A...1G. doi: 10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ a b c d e f g h Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv: 1108.4971, Bibcode: 2012AstL...38..331A, doi: 10.1134/S1063773712050015, S2CID 119257644.
- ^ a b Mason, B. D.; et al. (2014). "The Washington Visual Double Star Catalog". The Astronomical Journal. 122 (6): 3466–3471. Bibcode: 2001AJ....122.3466M. doi: 10.1086/323920.
- ^ a b Osawa, Kiyoteru (1959). "Spectral Classification of 533 B8-A2 Stars and the Mean Absolute Magnitude of A0 V Stars". Astrophysical Journal. 130: 159. Bibcode: 1959ApJ...130..159O. doi: 10.1086/146706.
- ^ Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv: 1606.08053. Bibcode: 2006AstL...32..759G. doi: 10.1134/S1063773706110065. S2CID 119231169.
- ^ a b c Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv: 1804.09365. Bibcode: 2018A&A...616A...1G. doi: 10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ a b Abt, Helmut A.; Snowden, Michael S. (February 1973). "The Binary Frequency for AP Stars". Astrophysical Journal Supplement. 25: 137. Bibcode: 1973ApJS...25..137A. doi: 10.1086/190265.
- ^ Hohle, M. M.; et al. (April 2010). "Masses and luminosities of O- and B-type stars and red supergiants". Astronomische Nachrichten. 331 (4): 349. arXiv: 1003.2335. Bibcode: 2010AN....331..349H. doi: 10.1002/asna.200911355. S2CID 111387483.
- ^ a b c d Ghazaryan, S.; et al. (2018). "New catalogue of chemically peculiar stars, and statistical analysis". Monthly Notices of the Royal Astronomical Society. 480 (3): 2953–2962. arXiv: 1807.06902. Bibcode: 2018MNRAS.480.2953G. doi: 10.1093/mnras/sty1912. S2CID 119062018.
- ^ "HD 172044". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-01-25.
- ^ Eggleton, P. P.; Tokovinin, A. A. (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. S2CID 14878976.
- ^ "HD 172044B". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-01-25.
External links
- alcyone software - star data pages Archived 2007-06-21 at the Wayback Machine
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Lyra |
| Right ascension | 18h 36m 37.34437s [1] |
| Declination | 33° 28′ 08.5352″ [1] |
| Apparent magnitude (V) | 5.41 [2] + 10.7 [3] |
| Characteristics | |
| Spectral type | B8IIpHgMn [4] |
| U−B color index | −0.509 [2] |
| B−V color index | −0.101±0.003 [2] |
| Astrometry | |
| A | |
| Radial velocity (Rv) | −32.5±0.8 [5] km/s |
| Proper motion (μ) |
RA: −7.966
[1]
mas/
yr Dec.: +0.690 [1] mas/ yr |
| Parallax (π) | 6.0990 ± 0.0893 mas [1] |
| Distance | 535 ± 8
ly (164 ± 2 pc) |
| Absolute magnitude (MV) | −0.53 [2] |
| B | |
| Proper motion (μ) |
RA: −7.403
[6]
mas/
yr Dec.: +0.479 [6] mas/ yr |
| Parallax (π) | 6.2391 ± 0.0221 mas [6] |
| Distance | 523 ± 2
ly (160.3 ± 0.6 pc) |
| Orbit [7] | |
| Period (P) | 1675 d |
| Semi-major axis (a) | ≥71.6×108 km |
| Eccentricity (e) | 0.16 |
| Periastron epoch (T) | 2,420,438.5 JD |
|
Argument of periastron (ω) (secondary) | 120° |
|
Semi-amplitude (K1) (primary) | 3.2 km/s |
| Details | |
| A | |
| Mass | 3.65±0.50 [8] M☉ |
| Luminosity | 262.17 [2] L☉ |
| Surface gravity (log g) | 3.90 [9] cgs |
| Temperature | 14,500 [9] K |
| Metallicity [Fe/H] | −0.25 [2] dex |
| Rotational velocity (v sin i) | 34 [9] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 172044 is a triple star [11] system in the northern constellation of Lyra. It has a blue-white hue and is visible to the naked eye with an apparent visual magnitude of 5.41. [2] The distance to the primary component is approximately 535 light years based on parallax. [1] It is drifting closer with a radial velocity of −32.5 km/s, and is predicted to come as near as 77.3 light-years to the Sun some 4.5 million years from now. [2]
The dual nature of the primary star, component A, was announced in 1973 by H. A. Abt and M. A. Snowden. It is a single-lined spectroscopic binary with a preliminary orbital period of 4.59 years and an eccentricity (ovalness) of 0.16. [7] The visible component is a B-type bright giant with a stellar classification of B8IIpHgMn, [4] where the suffix notation indicates it is a chemically peculiar mercury-manganese star. [9]
Component B is a magnitude 9.40 companion of an unknown spectral type. [12] It was first reported by F. G. W. Struve in 1830. As of 2016, it has an angular separation of 7.2 arcseconds along a position angle of 204° from the brighter component. [3]
References
- ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv: 1804.09365. Bibcode: 2018A&A...616A...1G. doi: 10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ a b c d e f g h Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv: 1108.4971, Bibcode: 2012AstL...38..331A, doi: 10.1134/S1063773712050015, S2CID 119257644.
- ^ a b Mason, B. D.; et al. (2014). "The Washington Visual Double Star Catalog". The Astronomical Journal. 122 (6): 3466–3471. Bibcode: 2001AJ....122.3466M. doi: 10.1086/323920.
- ^ a b Osawa, Kiyoteru (1959). "Spectral Classification of 533 B8-A2 Stars and the Mean Absolute Magnitude of A0 V Stars". Astrophysical Journal. 130: 159. Bibcode: 1959ApJ...130..159O. doi: 10.1086/146706.
- ^ Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv: 1606.08053. Bibcode: 2006AstL...32..759G. doi: 10.1134/S1063773706110065. S2CID 119231169.
- ^ a b c Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv: 1804.09365. Bibcode: 2018A&A...616A...1G. doi: 10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ a b Abt, Helmut A.; Snowden, Michael S. (February 1973). "The Binary Frequency for AP Stars". Astrophysical Journal Supplement. 25: 137. Bibcode: 1973ApJS...25..137A. doi: 10.1086/190265.
- ^ Hohle, M. M.; et al. (April 2010). "Masses and luminosities of O- and B-type stars and red supergiants". Astronomische Nachrichten. 331 (4): 349. arXiv: 1003.2335. Bibcode: 2010AN....331..349H. doi: 10.1002/asna.200911355. S2CID 111387483.
- ^ a b c d Ghazaryan, S.; et al. (2018). "New catalogue of chemically peculiar stars, and statistical analysis". Monthly Notices of the Royal Astronomical Society. 480 (3): 2953–2962. arXiv: 1807.06902. Bibcode: 2018MNRAS.480.2953G. doi: 10.1093/mnras/sty1912. S2CID 119062018.
- ^ "HD 172044". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-01-25.
- ^ Eggleton, P. P.; Tokovinin, A. A. (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. S2CID 14878976.
- ^ "HD 172044B". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-01-25.
External links
- alcyone software - star data pages Archived 2007-06-21 at the Wayback Machine