Astronomy:Mu Pictoris
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Pictor |
| Right ascension | 06h 31m 58.31021s[1] |
| Declination | −58° 45′ 13.8117″[1] |
| Apparent magnitude (V) | 5.69[2] (5.71 + 9.43)[3] |
| Characteristics | |
| Spectral type | B9 Ve[4] or B9 IVn + A8 V:p?[5] |
| U−B color index | −0.17[2] |
| B−V color index | −0.06[2] |
| Astrometry | |
| Radial velocity (Rv) | +0.40±1.00[6] km/s |
| Proper motion (μ) | RA: −1.34[1] mas/yr Dec.: +1.77[1] mas/yr |
| Parallax (π) | 4.31 ± 0.38[1] mas |
| Distance | 760 ± 70 ly (230 ± 20 pc) |
| Absolute magnitude (MV) | 0.20/3.75[7] |
| Details | |
| μ Pic A | |
| Mass | 3.60±0.09[8] M☉ |
| Luminosity | 355[8] L☉ |
| Temperature | 10,568[8] K |
| Rotational velocity (v sin i) | 228[8] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
μ Pictoris, Latinised as Mu Pictoris, is a binary star[3] system in the southern constellation Pictor. It is bright enough to be dimly visible to the naked eye, having a combined apparent visual magnitude of 5.69.[2] Based upon an annual parallax shift of 4.31 mas as seen from Earth,[1] the system is located roughly 760 light years distant from the Sun. As of 2010, the pair have an angular separation of 2.46 arc seconds along a position angle of 221°.[4]
The primary, designated component A, is a blue-white star with a visual magnitude of 5.71[3] and a stellar classification of B9 Ve[4] or B9 IVn.[5] The first classification suggests is a B-type main-sequence star, with the 'e' suffix indicating a Be star. The second may instead indicate a somewhat more evolved B-type star that is spinning rapidly, resulting in "nebulous" absorption lines. Photometrically, it shows a pulsation period of 0.397 days, which is likely the same as the rotation period.[10]
The secondary companion, component B, is a white-hued star of magnitude 9.43[3] with a classification of A8 V:p?.[5] This indicates it is an A-type main-sequence star, with the 'p?' suffix suggesting it may be chemically peculiar while the ':' notation says there is some uncertainty about the general classification.
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 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 Hurly, P. R. (1975), "Combined-light UBV Photometry of 103 Bright Southern Visual Doubles", Monthly Notes of the Astronomical Society of Southern Africa 34: 7, Bibcode: 1975MNSSA..34....7H.
- ↑ 3.0 3.1 3.2 3.3 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.
- ↑ 4.0 4.1 4.2 Oudmaijer, René D.; Parr, Andrew M. (July 2010), "The binary fraction and mass ratio of Be and B stars: a comparative Very Large Telescope/NACO study", Monthly Notices of the Royal Astronomical Society 405 (4): 2439–2446, doi:10.1111/j.1365-2966.2010.16609.x, Bibcode: 2010MNRAS.405.2439O.
- ↑ 5.0 5.1 5.2 Corbally, C. J. (1984), "Close visual binaries. I - MK classifications", Astrophysical Journal Supplement Series 55: 657, doi:10.1086/190973, Bibcode: 1984ApJS...55..657C.
- ↑ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics 546: 14, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D.
- ↑ Corbally, C. J. (December 1984), "Close visual binaries. III - Parameters and evolutionary status", Astronomical Journal 89: 1887–1896, doi:10.1086/113700, Bibcode: 1984AJ.....89.1887C.
- ↑ 8.0 8.1 8.2 8.3 Zorec, J.; Royer, F. (January 2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics 537: A120, doi:10.1051/0004-6361/201117691, Bibcode: 2012A&A...537A.120Z.
- ↑ "mu. Pic". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=mu.+Pic.
- ↑ Balona, L. A. (December 1995), "Tests of the Pulsation and Starspot Models for the Periodic Be-Stars", Monthly Notices of the Royal Astronomical Society 277 (4): 1547, doi:10.1093/mnras/277.4.1547, Bibcode: 1995MNRAS.277.1547B.
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