F Hydrae

From Wikipedia, the free encyclopedia
  (Redirected from HD 74395)
Jump to: navigation, search
F Hydrae
Hydra constellation map.svg
Red circle.svg

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]
Spectral type G1Ib[3]
B−V color index +0.80[2]
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
Distance 770 ± 30 ly
(236 ± 9 pc)
Absolute magnitude (MV) −2.77[5]
Mass 5.2[3] M
Radius 110[6] R
Surface gravity (log g) 2.08[3] cgs
Temperature 5,370[3] K
Metallicity [Fe/H] −0.01[7] dex
Rotational velocity (v sin i) 10.5[8] km/s
Age 89[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

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]


  1. ^ a b c d e Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752free to read. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. 
  2. ^ a b 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. ^ a b c d e 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:1411.2722free to read. 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/0012289free to read. 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:1204.4115free to read. 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:1212.6057free to read. 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:0911.1335free to read. Bibcode:2010MNRAS.402.1369L. doi:10.1111/j.1365-2966.2009.15979.x. 
  10. ^ a b 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.