Alpha Volantis
Alpha Volantis (α Vol, α Volantis) is a binary star[12] system in the southern constellation Volans. It has an apparent visual magnitude of +4.00, which is bright enough to be seen with the naked eye. Based upon parallax measurements made with the Hipparcos spacecraft, it is located at a distance of 125 light years from the Sun. As of 2010, the two components of this system had an angular separation of 0.0318″ along a position angle of 286.9°. The magnitude difference between the two components is 0.1.[13] It is considered a member of the Sirius supercluster.[5]
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Volans |
Right ascension | 09h 02m 26.79592s[1] |
Declination | −66° 23′ 45.8727″[1] |
Apparent magnitude (V) | +4.00[2] |
Characteristics | |
Spectral type | kA3hA5mA5 V[3] |
U−B color index | +0.13[2] |
B−V color index | +0.14[2] |
Astrometry | |
Radial velocity (Rv) | +4.9[4] km/s |
Proper motion (μ) | RA: −2.00[1] mas/yr Dec.: +95.51[1] mas/yr |
Parallax (π) | 26.11 ± 0.12[1] mas |
Distance | 124.9 ± 0.6 ly (38.3 ± 0.2 pc) |
Absolute magnitude (MV) | +1.60[5] |
Orbit[6] | |
Period (P) | 0.652 ± 0.001 yr |
Semi-major axis (a) | 0.0321 ± 0.0013″ |
Eccentricity (e) | 0.041 ± 0.038 |
Inclination (i) | 101.9 ± 2.3° |
Longitude of the node (Ω) | 105.3 ± 1.4° |
Periastron epoch (T) | 2015.593 ± 0.063 |
Argument of periastron (ω) (secondary) | 248.5 ± 34.2° |
Details | |
Mass | 1.87[7] M☉ |
Radius | 1.9[8] R☉ |
Surface gravity (log g) | 4.09[3] cgs |
Temperature | 8,198[3] K |
Metallicity [Fe/H] | +0.19[3] dex |
Rotational velocity (v sin i) | 30.6±0.4[9] km/s |
Age | 427+183 −377[10] Myr |
Other designations | |
Database references | |
SIMBAD | data |
The primary component is an Am star with a stellar classification of kA3hA5mA5 V.[3] This notation indicates the star has the weak calcium II K-line of an A3 star, and the hydrogen and metallic lines of an A5 star.[14] It has an estimated age of 427 million years.[10] In 1992, it was found to be emitting an infrared excess, suggesting the presence of a circumstellar disk of dust.[15] However, subsequent observations have not confirmed this.[16]
References
- van Leeuwen, F. (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, S2CID 18759600.
- Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data. SIMBAD, Bibcode:1986EgUBV........0M.
- 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, arXiv:astro-ph/0603770, Bibcode:2006AJ....132..161G, doi:10.1086/504637, S2CID 119476992.
- Wielen, R.; et al. (1999), "Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions", Veröff. Astron. Rechen-Inst. Heidelb, Astronomisches Rechen-Institut Heidelberg, 35 (35): 1, Bibcode:1999VeARI..35....1W.
- Eggen, Olin J. (August 1998), "The Sirius Supercluster and Missing Mass near the Sun", The Astronomical Journal, 116 (2): 782–788, Bibcode:1998AJ....116..782E, doi:10.1086/300465.
- Tokovinin, Andrei; Mason, Brian D.; Mendez, Rene A.; Horch, Elliott P.; Briceño, Cesar (2019), "Speckle Interferometry at SOAR in 2018", The Astronomical Journal, 158 (1): 48, arXiv:1905.10436, Bibcode:2019AJ....158...48T, doi:10.3847/1538-3881/ab24e4, S2CID 197431463
- 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, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID 33401607.
- Pasinetti Fracassini, L. E.; Pastori, L.; Covino, S.; Pozzi, A. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics (Third ed.), 367 (2): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
- Díaz, C. G.; et al. (July 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, S2CID 119286673.
- Song, Inseok; et al. (February 2001), "Ages of A-Type Vega-like Stars from uvbyβ Photometry", The Astrophysical Journal, 546 (1): 352–357, arXiv:astro-ph/0010102, Bibcode:2001ApJ...546..352S, doi:10.1086/318269, S2CID 18154947.
- "alf Vol". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2016-09-02.
- 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, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
- Hartkopf, William I.; et al. (2012), "Speckle Interferometry at SOAR in 2010 and 2011: Measures, Orbits, and Rectilinear Fits", The Astronomical Journal, 143 (2): 19, Bibcode:2012AJ....143...42H, doi:10.1088/0004-6256/143/2/42, 42.
- Gray, Richard O.; Corbally, Christopher J. (2009), Stellar Spectral Classification, Princeton, New Jersey: Princeton University Press, p. 309, ISBN 978-0-691-12511-4.
- Cheng, K.-P.; et al. (September 1992), "Newly identified main-sequence A stars with circumstellar dust", Astrophysical Journal, Part 2, 396 (2): L83–L86, Bibcode:1992ApJ...396L..83C, doi:10.1086/186522.
- Gáspár, András; et al. (May 2013), "The Collisional Evolution of Debris Disks", The Astrophysical Journal, 768 (1): 29, arXiv:1211.1415, Bibcode:2013ApJ...768...25G, doi:10.1088/0004-637X/768/1/25, S2CID 119295265, 25.