Astronomy:C Hydrae

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Short description: Star in the constellation Hydra
C Hydrae
Location of C Hydrae (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Hydra[1]
Right ascension  08h 25m 39.63201s[2]
Declination −03° 54′ 23.1178″[2]
Apparent magnitude (V) 3.90[3]
Characteristics
Evolutionary stage main sequence[4]
Spectral type A0 Va[5]
B−V color index −0.012±0.003[1]
Astrometry
Radial velocity (Rv)+10.00±1.78[6] km/s
Proper motion (μ) RA: −66.43[2] mas/yr
Dec.: −23.41[2] mas/yr
Parallax (π)26.66 ± 0.19[2] mas
Distance122.3 ± 0.9 ly
(37.5 ± 0.3 pc)
Absolute magnitude (MV)1.04[1]
Details
Mass2.3[7] M☉
Radius2.5[7] R☉
Luminosity37[7] L☉
Surface gravity (log g)4.20[8] cgs
Temperature9,074[7] K
Metallicity [Fe/H]−0.04[9] dex
Rotational velocity (v sin i)129[8] km/s
Age162[8] Myr
Other designations
C Hya, 30 Mon, BD−03°2339, HD 71155, HIP 41307, HR 3314, SAO 135896[10]
Database references
SIMBADdata

C Hydrae is a single[11] star in the equatorial constellation of Hydra,[10] located 122 light years away from the Sun.[2] It has the Flamsteed designation 30 Monocerotis,[10] assigned when it belonged to the constellation Monoceros. The object is visible to the naked eye as a white-hued star with an apparent visual magnitude of 3.90.[3] It is moving away from the Earth with a heliocentric radial velocity of +10 km/s.[6]

This is an A-type main-sequence star with a stellar classification of A0 Va.[5] It is around 162[8] million years old with a high rate of spin, showing a projected rotational velocity of 129 km/s. The star has 2.3 times the mass of the Sun and about 2.5 times the Sun's radius. It is radiating 37 times the luminosity of the Sun from its photosphere at an effective temperature of 9,074 K.

A statistically significant infrared excess has been detected, indicating a debris disk is orbiting 2.0±0.1 astronomical unit|AU from the host star with a blackbody temperature of 499±3 K. It is comparable in size to the asteroid belt.[12] Unexplained X-ray emission has also been detected coming from these coordinates – stars of this class are not normally expected to show X-ray emission, so it may be coming from a background source or an unseen companion.[13]

References

  1. ↑ 1.0 1.1 1.2 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.  XHIP record for this object at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 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 Baines, Ellyn K. et al. (2018), "Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer", The Astronomical Journal 155 (1): 30, doi:10.3847/1538-3881/aa9d8b, Bibcode: 2018AJ....155...30B. 
  4. ↑ Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy and Astrophysics 537: A120. doi:10.1051/0004-6361/201117691. Bibcode: 2012A&A...537A.120Z. 
  5. ↑ 5.0 5.1 Gray, R. O. et al. (July 2006), "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample", The Astronomical Journal 132 (1): 161–170, doi:10.1086/504637, Bibcode: 2006AJ....132..161G. 
  6. ↑ 6.0 6.1 de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics 546: 14, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D. 
  7. ↑ 7.0 7.1 7.2 7.3 Hardegree-Ullman, Kevin K.; Apai, Dániel; Bergsten, Galen J.; Pascucci, Ilaria; López-Morales, Mercedes (2023), "Bioverse: A Comprehensive Assessment of the Capabilities of Extremely Large Telescopes to Probe Earth-like O2 Levels in Nearby Transiting Habitable-zone Exoplanets", The Astronomical Journal 165 (6): 267, doi:10.3847/1538-3881/acd1ec, Bibcode: 2023AJ....165..267H. 
  8. ↑ 8.0 8.1 8.2 8.3 David, Trevor J.; Hillenbrand, Lynne A. (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. ↑ Gáspár, András; Rieke, George H.; Ballering, Nicholas (2016), "The Correlation between Metallicity and Debris Disk Mass", The Astrophysical Journal 826 (2): 171, doi:10.3847/0004-637X/826/2/171, Bibcode: 2016ApJ...826..171G. 
  10. ↑ 10.0 10.1 10.2 "30 Mon". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=30+Mon. 
  11. ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869–879, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E. 
  12. ↑ Moerchen, Margaret M. et al. (November 2010), "High Spatial Resolution Imaging of Thermal Emission from Debris Disks", The Astrophysical Journal 723 (2): 1418–1435, doi:10.1088/0004-637X/723/2/1418, Bibcode: 2010ApJ...723.1418M. 
  13. ↑ Schröder, C.; Schmitt, J. H. M. M. (November 2007), "X-ray emission from A-type stars", Astronomy and Astrophysics 475 (2): 677–684, doi:10.1051/0004-6361:20077429, Bibcode: 2007A&A...475..677S. 



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