Astronomy:F Hydrae

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Short description: Star in the constellation Hydra
F Hydrae
Location of F Hya (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Hydra[1]
Right ascension  08h 43m 40.37345s[2]
Declination −07° 15′ 01.4323″[2]
Apparent magnitude (V) 4.64[3]
Characteristics
Spectral type G1Ib[4]
B−V color index +0.80[3]
Astrometry
Radial velocity (Rv)28.50[5] km/s
Proper motion (μ) RA: −11.62[2] mas/yr
Dec.: −1.36[2] mas/yr
Parallax (π)4.24 ± 0.17[2] mas
Distance770 ± 30 ly
(236 ± 9 pc)
Absolute magnitude (MV)−2.77[6]
Details
Mass5.2[4] M☉
Radius110[7] R☉
Luminosity4,502[7] L☉
Surface gravity (log g)2.08[4] cgs
Temperature5,288[7] K
Metallicity [Fe/H]−0.01[8] dex
Rotational velocity (v sin i)10.5[9] km/s
Age89[4][10] Myr
Other designations
F Hya, 31 Mon,[11] 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.[11] With about five times the mass of the Sun, it is a relatively low mass yellow supergiant several thousand times more luminous than the Sun.

F Hya is a catalogued as a triple star, with 8th magnitude BD−06°2707 80" away and 13th magnitude companion at 57".[12]

References

  1. ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific 99 (617): 695. doi:10.1086/132034. Bibcode: 1987PASP...99..695R  Constellation record for this object at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V. 
  3. ↑ 3.0 3.1 Luck, R. Earle (2014). "Parameters and Abundances in Luminous Stars". The Astronomical Journal 147 (6): 137. doi:10.1088/0004-6256/147/6/137. Bibcode: 2014AJ....147..137L. 
  4. ↑ 4.0 4.1 4.2 4.3 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. doi:10.1093/mnras/stu2299. Bibcode: 2015MNRAS.446.3447L. 
  5. ↑ Gontcharov, G. A. (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. Bibcode: 2006AstL...32..759G. 
  6. ↑ 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. doi:10.1111/j.1365-2966.2010.17217.x. Bibcode: 2010MNRAS.408.1568K. 
  7. ↑ 7.0 7.1 7.2 Fetherolf, Tara; Pepper, Joshua; Simpson, Emilie; Kane, Stephen R.; Močnik, Teo; English, John Edward; Antoci, Victoria; Huber, Daniel et al. (2023). "Variability Catalog of Stars Observed during the TESS Prime Mission". The Astrophysical Journal Supplement Series 268 (1): 4. doi:10.3847/1538-4365/acdee5. Bibcode: 2023ApJS..268....4F. 
  8. ↑ 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. doi:10.1111/j.1365-2966.2012.21117.x. Bibcode: 2012MNRAS.423.3268K. 
  9. ↑ 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 (1): 11–26. doi:10.1111/j.1365-2966.2012.21617.x. Bibcode: 2012MNRAS.427...11L. 
  10. ↑ 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. doi:10.1111/j.1365-2966.2009.15979.x. Bibcode: 2010MNRAS.402.1369L. 
  11. ↑ 11.0 11.1 Pickering, Edward Charles (1903). "A catalogue of 1520 bright stars". Annals of Harvard College Observatory 48 (4): 125. Bibcode: 1903AnHar..48..125P. 
  12. ↑ 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. doi:10.1086/323920. Bibcode: 2001AJ....122.3466M. 



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