HD 149989
 A light curve of HD 149989 from Hipparcos data, assuming a period of 0.4266 days, adapted from Aerts et al. (1998)[1] | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Ara |
| Right ascension | 16h 40m 44.39899s[2] |
| Declination | −51° 28′ 41.7258″[2] |
| Apparent magnitude (V) | 6.30[3] |
| Characteristics | |
| Spectral type | A9 V[4] or F1 V nn m-4[5] |
| B−V color index | 0.321±0.006[6] |
| Variable type | γ Dor[3] |
| Astrometry | |
| Radial velocity (Rv) | 45.9±0.5[7] km/s |
| Proper motion (μ) | RA: +11.741[2] mas/yr Dec.: +131.264[2] mas/yr |
| Parallax (π) | 19.5759 ± 0.0521 mas[2] |
| Distance | 166.6 ± 0.4 ly (51.1 ± 0.1 pc) |
| Absolute magnitude (MV) | 2.83[6] |
| Details | |
| Mass | 1.60[8] M☉ |
| Radius | 1.70+0.08 −0.12[2] R☉ |
| Luminosity | 6.27±0.02[2] L☉ |
| Surface gravity (log g) | 4.21±0.14[8] cgs |
| Temperature | 7,003+257 −159[2] K |
| Rotational velocity (v sin i) | 136[9] km/s |
| Age | 1.144[8] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 149989 is a single,[3] variable star in the southern constellation of Ara, located near the western constellation border with Norma. It has the variable star designation V872 Arae, while HD 149989 is the identifier from the Henry Draper Catalogue. This is a dim star near the lower limit of visibility to the naked eye with an apparent visual magnitude that fluctuates around 6.30.[3] It is located at a distance of 167 light years from the Sun based on parallax, and is drifting further away with a radial velocity of 46 km/s.[7]
This object is an A-type main-sequence star with a stellar classification of A9 V.[4] A 2016 survey of γ Doradus stars found a class of F1 V nn m-4, where the 'nn' indicates "nebulous" lines due to rapid rotation and the 'm-4' means a metal-poor star with metal lines that match a class of A7.[5] This is a confirmed variable star of the Gamma Doradus type with a period of 0.42658 days.[3] It is around 1.1[8] billion years old and is spinning with a projected rotational velocity of 136 km/s.[9]
References
[edit]- ^ Aerts, C.; Eyer, L.; Kestens, E. (September 1998). "The discovery of new gamma Doradus stars from the HIPPARCOS mission". Astronomy & Astrophysics. 337: 790–796. Bibcode:1998A&A...337..790A. Retrieved 26 October 2021.
- ^ a b c d e f g h 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 De Cat, P.; et al. (April 2006), "A spectroscopic study of southern (candidate) γ Doradus stars. I. Time series analysis", Astronomy and Astrophysics, 449 (1): 281–292, arXiv:astro-ph/0511207, Bibcode:2006A&A...449..281D, doi:10.1051/0004-6361:20053655, S2CID 119518208
- ^ a b Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 2, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
- ^ a b Kahraman Aliçavuș, F.; et al. (May 2016), "Spectroscopic survey of γ Doradus stars - I. Comprehensive atmospheric parameters and abundance analysis of γ Doradus stars", Monthly Notices of the Royal Astronomical Society, 458 (3): 2307–2322, arXiv:1602.06514, Bibcode:2016MNRAS.458.2307K, doi:10.1093/mnras/stw393, S2CID 16477998.
- ^ a b 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 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 d David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID 33401607.
- ^ a b Royer, F.; et al. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics, 463 (2): 671–682, arXiv:astro-ph/0610785, Bibcode:2007A&A...463..671R, doi:10.1051/0004-6361:20065224, S2CID 18475298.
- ^ "V872 Ara". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-02-04.
External links
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