Omicron Boötis
| Observation data EpochJ2000.0EquinoxJ2000.0(ICRS) | |
|---|---|
| Constellation | Boötes |
| Right ascension | 14h45m14.46026s[1] |
| Declination | +16° 57′ 51.4078″[1] |
| Apparent magnitude(V) | +4.60[2] |
| Characteristics | |
| Spectral type | G8.5 III[3] |
| U−Bcolor index | +0.75[2] |
| B−Vcolor index | +0.98[2] |
| Astrometry | |
| Radial velocity(Rv) | −9.18[4]km/s |
| Proper motion(μ) | RA:−60.69[1]mas/yr Dec.:−50.56[1]mas/yr |
| Parallax(π) | 13.42 ± 0.24mas[1] |
| Distance | 243 ± 4ly (75 ± 1pc) |
| Absolute magnitude(MV) | 0.70[5] |
| Details | |
| Mass | 2.05[4]M☉ |
| Radius | 11[6]R☉ |
| Luminosity | 85[4]L☉ |
| Surface gravity(logg) | 2.7[6]cgs |
| Temperature | 4,864±25[4]K |
| Metallicity[Fe/H] | −0.10[6]dex |
| Rotational velocity(vsini) | 3.6[6]km/s |
| Age | 2.72[4]Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Omicron Boötis(ο Boötis) is a yellow-huedstarin the northernconstellationofBoötes.With anapparent visual magnitudeof +4.60,[2]it is a fifth magnitude star that is visible to the naked eye. Based upon an annualparallaxshift of 13.42masas seen from the Earth,[1]it is located about 243light yearsfrom theSun.The star is moving closer to the Sun with aradial velocityof −9 km/s.[6]
At the age of 2.72 billion years,[4]this is anevolvedG-typegiant starwith astellar classificationof G8.5 III.[3]It belongs to the so-called "red clump",which indicates it is generating energy throughhelium fusionat itscore.[8]Although it displays a higher abundance of barium than is normal for a star of its type, Williams (1975) considers its status as aBarium starto be "very doubtful".[9]The star has double[4]themass of the Sunand has expanded to 11[6]times theSun's radius.It is radiating 85 times theSun's luminosityfrom its enlargedphotosphereat aneffective temperatureof 4,864 K.[4]
References
[edit]- ^abcdefvan 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,S2CID18759600.
- ^abcdJohnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars",Communications of the Lunar and Planetary Laboratory,4(99): 99,Bibcode:1966CoLPL...4...99J.
- ^abKeenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars",Astrophysical Journal Supplement Series,71:245,Bibcode:1989ApJS...71..245K,doi:10.1086/191373.
- ^abcdefghLuck, R. Earle (September 2015), "Abundances in the Local Region. I. G and K Giants",The Astronomical Journal,150(3): 23,arXiv:1507.01466,Bibcode:2015AJ....150...88L,doi:10.1088/0004-6256/150/3/88,S2CID118505114,88.
- ^McWilliam, Andrew (December 1990), "High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances",Astrophysical Journal Supplement Series,74:1075–1128,Bibcode:1990ApJS...74.1075M,doi:10.1086/191527.
- ^abcdefMassarotti, Alessandro; et al. (January 2008), "Rotational and radial velocities for a sample of 761 HIPPARCOS giants and the role of binarity",The Astronomical Journal,135(1): 209–231,Bibcode:2008AJ....135..209M,doi:10.1088/0004-6256/135/1/209,S2CID121883397.
- ^"omi Boo".SIMBAD.Centre de données astronomiques de Strasbourg.Retrieved2017-09-09.
- ^Alves, David R. (August 2000), "K-Band Calibration of the Red Clump Luminosity",The Astrophysical Journal,539(2): 732–741,arXiv:astro-ph/0003329,Bibcode:2000ApJ...539..732A,doi:10.1086/309278,S2CID16673121.
- ^Williams, P. M. (February 1975), "Stellar compositions from narrow-band photometry - V. Barium abundances for 200 evolved stars",Monthly Notices of the Royal Astronomical Society,170(2): 343–362,Bibcode:1975MNRAS.170..343W,doi:10.1093/mnras/170.2.343.
External links
[edit]- Hoffleit; et al. (1991),"HR 5502",Bright Star Catalogue(5th Revised ed.),retrieved2017-09-12.
- "omi Boo",Aladin previewer,Centre de Données astronomiques de Strasbourg,retrieved2017-09-12.
