Astronomy:HD 201507

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Short description: High proper motion star in the constellation Equuleus
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
Distance214 ± 4 ly
(66 ± 1 pc)
Absolute magnitude (MV)2.12[6]
Details
Mass1.45±0.23[7] M☉
Radius2.2±0.1[7] R☉
Luminosity9.147±0.21[1] L☉
Surface gravity (log g)3.91±0.09[7] cgs
Temperature6,846±233[8] K
Metallicity [Fe/H]+0.09[9] dex
Rotational velocity (v sin i)16.4±10.6[10] km/s
Age1.21[8] Gyr
Other designations
BD+02°4311, GC 29582, HD 201507, HIP 104481, HR 8095, SAO 126587[11]
Database references
SIMBADdata

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. ↑ 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. ↑ 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. ↑ 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. ↑ 4.0 4.1 Cousins, A. W. J. (1971). "Photometric standard stars". Royal Observatory Annals 7. Bibcode: 1971ROAn....7.....C. 
  5. ↑ 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. 
  6. ↑ 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. ↑ 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. ↑ 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. ↑ 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. ↑ 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. 
  11. ↑ "HD 201507". http://simbad.u-strasbg.fr/simbad/sim-id?mescat.mk=on&Ident=%401398820&Name=HD+201507/. 
  12. ↑ 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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