HD 201507

Last updated
HD 201507
Equuleus constellation map.svg
Red circle.svg
Location of HD 201507 (circled)
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Equuleus [1]
Right ascension 21h 09m 58.2645s [2]
Declination +02° 56′ 37.310″ [2]
Apparent magnitude  (V)6.43±0.01 [3]
Characteristics
Evolutionary stage subgiant [4]
Spectral type F5 IV [5]
U−B color index +0.06 [6]
B−V color index +0.37 [6]
Astrometry
Radial velocity (Rv)−42.8±2.4 [7] km/s
Proper motion (μ)RA: +48.902 mas/yr [2]
Dec.: +10.883 mas/yr [2]
Parallax (π)15.2530±0.3122  mas [2]
Distance 214 ± 4  ly
(66 ± 1  pc)
Absolute magnitude  (MV)+2.12 [1]
Details
Mass 1.45±0.23 [8]   M☉
Radius 2.2±0.1 [8]   R☉
Luminosity 9.147±0.21 [2]   L☉
Surface gravity (log g)3.91±0.09 [8]   cgs
Temperature 6,846±233 [9]   K
Metallicity [Fe/H]+0.09 [10]   dex
Rotational velocity (v sin i)16.4±10.6 [11]  km/s
Age 1.21 [9]   Gyr
Other designations
13 G. Equulei [12] , AG+02°2701, BD+02°4311, GC 29582, HD 201507, HIP 104481, HR 8095, SAO 126587 [13]
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, [3] placing it near the limit for naked eye visibility. Parallax measurements place the object at a distance of 214 light years [2] and it is currently drifting closer with a heliocentric radial velocity of −43  km/s . [7]

There have been disagreements in classifying the star's spectrum. Eugene A. Harlan found a spectral classification of F5 IV, [5] 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, [14] 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☉ [8] due to its evolved state. It shines with a luminosity of about 9  L☉ [2] from its photosphere at an effective temperature of 6,846 K. [9] HD 201507 is slightly metal enriched, with a metallicity 123% that of the Sun. [10] This star has a modest projected rotational velocity of 16  km/s [11] and is estimated to be 1.21 billion years old, [9] only a quarter the age of the Sun.

References

  1. 1 2 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. XHIP record for this object at VizieR.
  2. 1 2 3 4 5 6 7 8 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.
  3. 1 2 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.
  4. ↑ do Nascimento, J. D., Jr.; Canto Martins, B. L.; Melo, C. H. F.; Porto De Mello, G.; De Medeiros, J. R. (2003). "On the link between rotation, chromospheric activity and Li abundance in subgiant stars". Astronomy and Astrophysics. 405 (2): 723. arXiv: astro-ph/0307196 . Bibcode:2003A&A...405..723D. doi:10.1051/0004-6361:20030633.
  5. 1 2 Harlan, E. A. (June 1974). "MK classifications for F-and G-type stars. 3". The Astronomical Journal. 79: 682. Bibcode:1974AJ.....79..682H. doi: 10.1086/111597 . ISSN   0004-6256.
  6. 1 2 Cousins, A. W. J. (1971). "Photometric standard stars". Royal Observatory Annals. 7. Bibcode:1971ROAn....7.....C.
  7. 1 2 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.
  8. 1 2 3 4 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 . ISSN   0004-6256.
  9. 1 2 3 4 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. arXiv: 1501.03154 . Bibcode:2015ApJ...804..146D. doi: 10.1088/0004-637X/804/2/146 . eISSN   1538-4357.
  10. 1 2 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. arXiv: 1705.00883 . Bibcode:2017MNRAS.469.3042N. doi: 10.1093/mnras/stx1077 . eISSN   1365-2966. ISSN   0035-8711.
  11. 1 2 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. arXiv: 1312.3474 . Bibcode:2014A&A...561A.126D. doi: 10.1051/0004-6361/201220762 . ISSN   0004-6361.
  12. ↑ Gould, B. A. Uranometria Argentina. Reprinted and updated by Pilcher, F. Archived from the original on 2012-02-27. Retrieved 2012-01-06.
  13. ↑ "HD 201507". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2021-07-05.
  14. ↑ 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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