Upsilon Herculis
| Observation data EpochJ2000.0EquinoxJ2000.0(ICRS) | |
|---|---|
| Constellation | Hercules |
| Right ascension | 16h02m47.89764s[1] |
| Declination | +46° 02′ 12.1371″[1] |
| Apparent magnitude(V) | 4.74[2] |
| Characteristics | |
| Spectral type | B9 III[3] |
| U−Bcolor index | −0.32[2] |
| B−Vcolor index | −0.11[2] |
| Astrometry | |
| Radial velocity(Rv) | +4.1±0.5[4]km/s |
| Proper motion(μ) | RA:+55.42[1]mas/yr Dec.:−61.29[1]mas/yr |
| Parallax(π) | 8.78 ± 0.18mas[1] |
| Distance | 371 ± 8ly (114 ± 2pc) |
| Absolute magnitude(MV) | 0.32[5] |
| Details | |
| Radius | 4.0[6]R☉ |
| Luminosity | 173[7]L☉ |
| Surface gravity(logg) | 3.80[8]cgs |
| Temperature | 10,152[7]K |
| Metallicity[Fe/H] | −0.30[8]dex |
| Rotational velocity(vsini) | 7.5[4]km/s |
| Age | 254[5]Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Upsilon Herculis(υ Her) is a solitary[10]starin theconstellationHercules.It is visible to the naked eye with anapparent visual magnitudeof 4.74.[2]Based upon an annualparallax shiftof 8.78masas seen from Earth, it is located around 371light yearsfrom theSun.At that distance, the visual magnitude is diminished by anextinction factorof 0.09 due tointerstellar dust.[5]
At an estimated age of 254 million years,[5]this appears to be anevolvedB-typegiant starwith astellar classificationof B9 III.[3]It is amercury-manganesechemically peculiar star,indicating the spectrum shows abnormal abundances of these elements.[4]The star has about four times theradius of the Sunand it radiates 173[7]times theSun's luminosityfrom itsphotosphereat aneffective temperatureof 10,152 K.[7]
References
[edit]- ^abcdevan 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.
- ^abcdMermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)",Catalogue of Eggen's UBV Data,SIMBAD,Bibcode:1986EgUBV........0M.
- ^abCowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications",Astronomical Journal,74:375–406,Bibcode:1969AJ.....74..375C,doi:10.1086/110819
- ^abcAdelman, S. J.; et al. (February 2006), "Elemental abundance analyses with DAO spectrograms. XXIX. The mercury-manganese stars 53 Tau, β Tau, γ Crv, and υ Her",Astronomy and Astrophysics,447(2): 685–690,Bibcode:2006A&A...447..685A,doi:10.1051/0004-6361:20053581.
- ^abcdGontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars",Astronomy Letters,38(11): 694–706,arXiv:1606.09028,Bibcode:2012AstL...38..694G,doi:10.1134/S1063773712110035,S2CID119108982.
- ^Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)",Astronomy and Astrophysics,367(3rd ed.): 521–524,arXiv:astro-ph/0012289,Bibcode:2001A&A...367..521P,doi:10.1051/0004-6361:20000451,S2CID425754.
- ^abcdMcDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars",Monthly Notices of the Royal Astronomical Society,427(1): 343–57,arXiv:1208.2037,Bibcode:2012MNRAS.427..343M,doi:10.1111/j.1365-2966.2012.21873.x,S2CID118665352.
- ^abSmith, K. C.; Dworetsky, M. M. (July 1993), "Elemental Abundances in Normal Late B-Stars and Hgmn-Stars from Co-Added IUE Spectra - Part One - Iron Peak Elements",Astronomy and Astrophysics,274(2): 335,Bibcode:1993A&A...274..335S.
- ^"* ups Her -- Star".SIMBAD.Centre de données astronomiques de Strasbourg.Retrieved2017-04-05.
{{cite web}}:CS1 maint: postscript (link) - ^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,S2CID14878976.
