Astronomy:HD 201507
| Observation data Epoch J2000.0 Equinox (celestial coordinates) | |
|---|---|
| Constellation | Equuleus |
| Right ascension | 21h 09m 58.2645s[1] |
| Declination | +02° 56′ 37.3096″[1] |
| Apparent magnitude (V) | 6.43±0.01[2] |
| Characteristics | |
| Spectral type | F5 IV[3] |
| U−B color index | +0.06[4] |
| B−V color index | +0.37[4] |
| Astrometry | |
| Radial velocity (Rv) | −42.8±2.4[5] km/s |
| Proper motion (μ) | RA: +48.902[1] mas/yr Dec.: +10.883[1] mas/yr |
| Parallax (π) | 15.2530 ± 0.3122[1] mas |
| Distance | 214 ± 4 ly (66 ± 1 pc) |
| Absolute magnitude (MV) | 2.12[6] |
| Details | |
| Mass | 1.45±0.23[7] M☉ |
| Radius | 2.2±0.1[7] R☉ |
| Luminosity | 9.147±0.21[1] L☉ |
| Surface gravity (log g) | 3.91±0.09[7] cgs |
| Temperature | 6,846±233[8] K |
| Metallicity [Fe/H] | +0.09[9] dex |
| Rotational velocity (v sin i) | 16.4±10.6[10] km/s |
| Age | 1.21[8] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 201507, also designated HR 8095, is a white-hued star located in the equatorial constellation Equuleus. It has an apparent magnitude of 6.43,[2] placing it near the limit for naked eye visibility. Parallax measurements place the object at a distance of 214 light years[1] and it is currently drifting closer with a heliocentric radial velocity of −43 km/s.[5]
There have been disagreements in classifying the star's spectrum. Eugene A. Harlan found a spectral classification of F5 IV,[3] indicating that it is a F-type subgiant that is evolving towards the red giant branch. On the other hand, Nancy Houk and Carrie Swift (1999) found a class of F2 V,[12] indicating that it is still on the main sequence.
HD 201507 has 1.45 times the mass of the Sun and a slightly enlarged radius of 2.2 R☉[7] due to its evolved state. It shines with a luminosity of about 9 solar luminosity[1] from its photosphere at an effective temperature of 6,846 K.[8] HD 201507 is slightly metal enriched, with a metallicity 123% that of the Sun.[9] This star has a modest projected rotational velocity of 16 km/s[10] and is estimated to be 1.21 billion years old,[8] only a quarter the age of the Sun.
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. ISSN 0004-6361. Bibcode: 2000A&A...355L..27H.
- ↑ 3.0 3.1 Harlan, E. A. (June 1974). "MK classifications for F-and G-type stars. 3.". The Astronomical Journal 79: 682. doi:10.1086/111597. ISSN 0004-6256. Bibcode: 1974AJ.....79..682H.
- ↑ 4.0 4.1 Cousins, A. W. J. (1971). "Photometric standard stars". Royal Observatory Annals 7. Bibcode: 1971ROAn....7.....C.
- ↑ 5.0 5.1 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. doi:10.1134/S1063773706110065. ISSN 1063-7737. Bibcode: 2006AstL...32..759G.
- ↑ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A.
- ↑ 7.0 7.1 7.2 7.3 Stassun, Keivan G. et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. ISSN 0004-6256. Bibcode: 2019AJ....158..138S.
- ↑ 8.0 8.1 8.2 8.3 David, Trevor J.; Hillenbrand, Lynne A. (12 May 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. doi:10.1088/0004-637X/804/2/146. Bibcode: 2015ApJ...804..146D.
- ↑ 9.0 9.1 Netopil, Martin (4 May 2017). "Metallicity calibrations for dwarf stars and giants in the Geneva photometric system". Monthly Notices of the Royal Astronomical Society 469 (3): 3042–3055. doi:10.1093/mnras/stx1077. ISSN 0035-8711. Bibcode: 2017MNRAS.469.3042N.
- ↑ 10.0 10.1 De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (January 2014). "A catalog of rotational and radial velocities for evolved stars: V. Southern stars⋆⋆⋆". Astronomy & Astrophysics 561: A126. doi:10.1051/0004-6361/201220762. ISSN 0004-6361. Bibcode: 2014A&A...561A.126D.
- ↑ "HD 201507". http://simbad.u-strasbg.fr/simbad/sim-id?mescat.mk=on&Ident=%401398820&Name=HD+201507/.
- ↑ Houk, Nancy; Swift, Carrie (1999). Michigan catalogue of two-dimensional spectral types for the HD Stars; vol. 5. Bibcode: 1999mctd.book.....H.
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