Eta1 Coronae Australis
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Corona Australis |
Right ascension | 18h 48m 50.48994s[1] |
Declination | −43° 40′ 48.1591″[1] |
Apparent magnitude (V) | 5.456[2] |
Characteristics | |
Spectral type | A3V[3] |
B−V color index | +0.13[4] |
Astrometry | |
Radial velocity (Rv) | −4.00 ± 4.2[5] km/s |
Proper motion (μ) | RA: 23.89[1] mas/yr Dec.: −19.32[1] mas/yr |
Parallax (π) | 9.70 ± 0.71[1] mas |
Distance | 340 ± 20 ly (103 ± 8 pc) |
Absolute magnitude (MV) | 0.84[6] |
Details | |
Surface gravity (log g) | 4.04[6] cgs |
Temperature | +4692 −444 8371[7] K |
Rotational velocity (v sin i) | 122.3[3] km/s |
Other designations | |
Database references | |
SIMBAD | data |
Eta1 Coronae Australis (η1 CrA) is a star located in the constellation Corona Australis. Its apparent magnitude is 5.456.[2] Parallax measurements by Hipparcos put it at a distance of 340 light-years, or 103 parsecs, away.[1]
Eta1 Coronae Australis is an A-type main-sequence star with an effective temperature of 8371 K.[7] It has broad spectrum absorption lines associated with its rotation period.[3]
References
- 1 2 3 4 5 6 van Leeuwen, F.; et al. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
- 1 2 Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H.
- 1 2 3 Díaz, C. G.; González, J. F.; Levato, H.; Grosso, M. (2011). "Accurate stellar rotational velocities using the Fourier transform of the cross correlation maximum". Astronomy & Astrophysics. 531: A143. arXiv:1012.4858. Bibcode:2011A&A...531A.143D. doi:10.1051/0004-6361/201016386.
- ↑ Johnson, H. L. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99. Bibcode:1966CoLPL...4...99J.
- ↑ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
- 1 2 Philip, A. Davis; Egret, D. (1980). "An Analysis of the Hauck / Mermilliod Catalogue of Homgeneous Four-Color Data - Part Two". Astronomy and Astrophysics Supplement. 40: 199. Bibcode:1980A&AS...40..199P.
- 1 2 Ammons, S. Mark; Robinson, Sarah E.; Strader, Jay; Laughlin, Gregory; Fischer, Debra; Wolf, Aaron (2006). "The N2K Consortium. IV. New Temperatures and Metallicities for More than 100,000 FGK Dwarfs". The Astrophysical Journal. 638 (2): 1004. arXiv:astro-ph/0510237. Bibcode:2006ApJ...638.1004A. doi:10.1086/498490.
This article is issued from
Wikipedia.
The text is licensed under Creative Commons - Attribution - Sharealike.
Additional terms may apply for the media files.