F Hydrae

F Hydrae


Location of F Hya (circled)

Observation data
Epoch J2000      Equinox J2000
Constellation Hydra
Right ascension 08h 43m 40.37345s[1]
Declination −07° 15′ 01.4323″[1]
Apparent magnitude (V) 4.64[2]
Characteristics
Spectral type G1Ib[3]
B−V color index +0.80[2]
Astrometry
Radial velocity (Rv)28.50[4] km/s
Proper motion (μ) RA: −11.62[1] mas/yr
Dec.: −1.36[1] mas/yr
Parallax (π)4.24 ± 0.17[1] mas
Distance770 ± 30 ly
(236 ± 9 pc)
Absolute magnitude (MV)−2.77[5]
Details
Mass5.2[3] M☉
Radius110[6] R☉
Surface gravity (log g)2.08[3] cgs
Temperature5,370[3] K
Metallicity [Fe/H]−0.01[7] dex
Rotational velocity (v sin i)10.5[8] km/s
Age89[3][9] Myr
Other designations
F Hya, 31 Mon,[10] HR 3459, HD 74395, BD−06°2708, SAO 136221, HIP 42835, WDS J08437-0714
Database references
SIMBADdata

F Hydrae, also known as HD 74395, is a star in the constellation Hydra with an apparent magnitude is 4.64. It was catalogued as 31 Monocerotis, but this name is now rarely used since the star is now within the boundaries of Hydra.[10] It is a low mass yellow supergiant around a thousand times brighter than the sun and five times as massive.

F Hya is a catalogued as a triple star, with 8th magnitude BD-06°2707 80" away and 13th magnitude companion at 57".[11]

References

  1. 1 2 3 4 5 Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
  2. 1 2 Luck, R. Earle (2014). "Parameters and Abundances in Luminous Stars". The Astronomical Journal. 147 (6): 137. Bibcode:2014AJ....147..137L. doi:10.1088/0004-6256/147/6/137.
  3. 1 2 3 4 5 Lyubimkov, Leonid S.; Lambert, David L.; Korotin, Sergey A.; Rachkovskaya, Tamara M.; Poklad, Dmitry B. (2015). "Carbon abundance and the N/C ratio in atmospheres of A-, F- and G-type supergiants and bright giants". Monthly Notices of the Royal Astronomical Society. 446 (4): 3447. arXiv:1411.2722Freely accessible. Bibcode:2015MNRAS.446.3447L. doi:10.1093/mnras/stu2299.
  4. ↑ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
  5. ↑ Kovtyukh, V. V.; Chekhonadskikh, F. A.; Luck, R. E.; Soubiran, C.; Yasinskaya, M. P.; Belik, S. I. (2010). "Accurate luminosities for F-G supergiants from FeII/FeI line depth ratios". Monthly Notices of the Royal Astronomical Society. 408 (3): 1568. Bibcode:2010MNRAS.408.1568K. doi:10.1111/j.1365-2966.2010.17217.x.
  6. ↑ Pasinetti Fracassini, L. E.; Pastori, L.; Covino, S.; Pozzi, A. (2001). "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics". Astronomy and Astrophysics. 367 (2): 521. arXiv:astro-ph/0012289Freely accessible. Bibcode:2001A&A...367..521P. doi:10.1051/0004-6361:20000451.
  7. ↑ Kovtyukh, V. V.; Gorlova, N. I.; Belik, S. I. (2012). "Accurate luminosities from the oxygen λ7771-4 Å triplet and the fundamental parameters of F-G supergiants". Monthly Notices of the Royal Astronomical Society. 423 (4): 3268. arXiv:1204.4115Freely accessible. Bibcode:2012MNRAS.423.3268K. doi:10.1111/j.1365-2966.2012.21117.x.
  8. ↑ Lyubimkov, Leonid S.; Lambert, David L.; Kaminsky, Bogdan M.; Pavlenko, Yakov V.; Poklad, Dmitry B.; Rachkovskaya, Tamara M. (2012). "Lithium abundance in atmospheres of F- and G-type supergiants and bright giants". Monthly Notices of the Royal Astronomical Society. 427: 11. arXiv:1212.6057Freely accessible. Bibcode:2012MNRAS.427...11L. doi:10.1111/j.1365-2966.2012.21617.x.
  9. ↑ Lyubimkov, Leonid S.; Lambert, David L.; Rostopchin, Sergey I.; Rachkovskaya, Tamara M.; Poklad, Dmitry B. (2010). "Accurate fundamental parameters for A-, F- and G-type Supergiants in the solar neighbourhood". Monthly Notices of the Royal Astronomical Society. 402 (2): 1369. arXiv:0911.1335Freely accessible. Bibcode:2010MNRAS.402.1369L. doi:10.1111/j.1365-2966.2009.15979.x.
  10. 1 2 Pickering, Edward Charles (1903). "A catalogue of 1520 bright stars". Annals of Harvard College Observatory. 48: 125. Bibcode:1903AnHar..48..125P.
  11. ↑ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466. Bibcode:2001AJ....122.3466M. doi:10.1086/323920.
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