Astronomy:Upsilon Herculis
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Hercules |
| Right ascension | 16h 02m 47.89764s[1] |
| Declination | +46° 02′ 12.1371″[1] |
| Apparent magnitude (V) | 4.74[2] |
| Characteristics | |
| Spectral type | B9 III[3] |
| U−B color index | −0.32[2] |
| B−V color 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 ± 0.18[1] mas |
| Distance | 371 ± 8 ly (114 ± 2 pc) |
| Absolute magnitude (MV) | 0.32[5] |
| Details | |
| Radius | 4.0[6] R☉ |
| Luminosity | 173[7] L☉ |
| Surface gravity (log g) | 3.80[8] cgs |
| Temperature | 10,152[7] K |
| Metallicity [Fe/H] | −0.30[8] dex |
| Rotational velocity (v sin i) | 7.5[4] km/s |
| Age | 254[5] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Upsilon Herculis (υ Her) is a solitary[10] star in the constellation Hercules. It is visible to the naked eye with an apparent visual magnitude of 4.74.[2] Based upon an annual parallax shift of 8.78 mas as seen from Earth, it is located around 371 light years from the Sun. At that distance, the visual magnitude is diminished by an extinction factor of 0.09 due to interstellar dust.[5]
At an estimated age of 254 million years,[5] this appears to be an evolved B-type giant star with a stellar classification of B9 III.[3] It is a mercury-manganese chemically peculiar star, indicating the spectrum shows abnormal abundances of these elements.[4] The star has about four times the radius of the Sun and it radiates 173[7] times the Sun's luminosity from its photosphere at an effective temperature of 10,152 K.[7]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 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.
- ↑ 2.0 2.1 2.2 2.3 Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data (SIMBAD), Bibcode: 1986EgUBV........0M.
- ↑ 3.0 3.1 Cowley, A. et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal 74: 375–406, doi:10.1086/110819, Bibcode: 1969AJ.....74..375C
- ↑ 4.0 4.1 4.2 Adelman, 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, doi:10.1051/0004-6361:20053581, Bibcode: 2006A&A...447..685A.
- ↑ 5.0 5.1 5.2 5.3 Gontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars", Astronomy Letters 38 (11): 694–706, doi:10.1134/S1063773712110035, Bibcode: 2012AstL...38..694G.
- ↑ Pasinetti Fracassini, L. E. et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics 367: 521–524, doi:10.1051/0004-6361:20000451, Bibcode: 2001A&A...367..521P.
- ↑ 7.0 7.1 7.2 7.3 McDonald, I. et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society 427 (1): 343–57, doi:10.1111/j.1365-2966.2012.21873.x, Bibcode: 2012MNRAS.427..343M.
- ↑ 8.0 8.1 Smith, 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. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%2A+ups+Her+--+Star.
- ↑ 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.
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