Nu Pavonis
  | |
| Observation data EpochJ2000EquinoxJ2000 | |
|---|---|
| Constellation | Pavo |
| Right ascension | 18h31m22.42509s[1] |
| Declination | −62° 16′ 41.8853″[1] |
| Apparent magnitude(V) | 4.64(4.60 - 4.64[2]) |
| Characteristics | |
| Evolutionary stage | main sequence[3] |
| Spectral type | B7III[4] |
| U−Bcolor index | −0.39[5] |
| B−Vcolor index | −0.11[5] |
| Variable type | SPB[2] |
| Astrometry | |
| Radial velocity(Rv) | +16.95[6]km/s |
| Proper motion(μ) | RA:−1.11[1]mas/yr Dec.:−45.31[1]mas/yr |
| Parallax(π) | 7.43 ± 0.24mas[1] |
| Distance | 440 ± 10ly (135 ± 4pc) |
| Absolute magnitude(MV) | -1.01[4] |
| Orbit[7] | |
| Period(P) | 1.711529±0.000005d |
| Eccentricity(e) | 0.0 |
| Periastronepoch(T) | 2,450,276.5502±0.0007HJD |
| Argument of periastron(ω) (secondary) | 127±12° |
| Semi-amplitude(K1) (primary) | 43.8±0.1km/s |
| Details | |
| Mass | 4.39[8]M☉ |
| Luminosity | 659[8]L☉ |
| Temperature | 12,764[8]K |
| Rotational velocity(vsini) | 125.0[9]km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
Nu Pavonisis a possibletriple star system[11]in the southernconstellationofPavo.It is visible to the naked eye as a faint star that varies inapparent visual magnitudefrom 4.60 to 4.64 over a period of 0.85584 days.[2]The system lies approximately 440light yearsfrom the Sun based onparallax,[1]and is drifting further away with aradial velocityof +17 km/s.[6]It is a possible member of the Wolf 630 group of co-moving stars.[3]
This is a single-linedspectroscopic binarysystem with anorbital periodof just 1.71 days in a circular orbit.[7]The unresolved[3]components are close enough that their tidal interaction is significant.[7]The visible component is aslowly pulsating B-type starwith astellar classificationof B7III.[4]This implies it is anevolvedgiant star,but it is actually more likely to be on themain sequence.AnX-ray emissionhas been detected from the pair.[3]
The third component is a visible companion, probably apre-main-sequence star,at magnitude 13.7 and separation3.1″.This star is estimated at 0.15 solar masses and an effective temperature of 3,192 K.[8]It too is an X-ray source.[3]
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.Vizier catalog entry
- ^abcWatson, C. L. (2006). "The International Variable Star Index (VSX)".The Society for Astronomical Sciences 25th Annual Symposium on Telescope Science. Held May 23–25.25:47.Bibcode:2006SASS...25...47W.
- ^abcdeStelzer, B.; et al. (September 2003). "Late B-type stars and their candidate companions resolved with Chandra".Astronomy and Astrophysics.407(3): 1067–1078.arXiv:astro-ph/0306401.Bibcode:2003A&A...407.1067S.doi:10.1051/0004-6361:20030934.S2CID16766165.
- ^abcAnderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation".Astronomy Letters.38(5): 331.arXiv:1108.4971.Bibcode:2012AstL...38..331A.doi:10.1134/S1063773712050015.S2CID119257644.Vizier catalog entry
- ^abDucati, J. R. (2002). "VizieR On-Line Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system".CDS/ADC Collection of Electronic Catalogues.2237.Bibcode:2002yCat.2237....0D.
- ^abPourbaix, D.; et al. (2004). "SB9: The ninth catalogue of spectroscopic binary orbits".Astronomy and Astrophysics.424(2): 727–732.arXiv:astro-ph/0406573.Bibcode:2004A&A...424..727P.doi:10.1051/0004-6361:20041213.S2CID119387088.
- ^abcDe Cat, P.; Aerts, C.; De Ridder, J.; Kolenberg, K.; Meeus, G.; Decin, L. (2000). "A study of bright southern slowly pulsating B stars. I. Determination of the orbital parameters and of the main frequency of the spectroscopic binaries".Astronomy and Astrophysics.355:1015–1030.Bibcode:2000A&A...355.1015D.
- ^abcdHubrig, S.; Le Mignant, D.; North, P.; Krautter, J. (2001). "Search for low-mass PMS companions around X-ray selected late B stars".Astronomy and Astrophysics.372:152–164.arXiv:astro-ph/0103201.Bibcode:2001A&A...372..152H.doi:10.1051/0004-6361:20010452.S2CID17507782.
- ^Glebocki, R.; Gnacinski, P. (2005). "Catalog of Stellar Rotational Velocities".VizieR On-Line Data Catalog: III/244.3244.Bibcode:2005yCat.3244....0G.Vizier catalog entry
- ^"nu. Pav".SIMBAD.Centre de données astronomiques de Strasbourg.Retrieved2019-10-01.
- ^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.
- ^"MAST: Barbara A. Mikulski Archive for Space Telescopes".Space Telescope Science Institute.Retrieved24 September2022.
