Astronomy:Mu Pictoris
| Observation data {{#ifeq:J2000.0|J2000.0 (ICRS)|Epoch J2000.0 Equinox J2000.0 (ICRS)| [[History:Epoch|Epoch J2000.0]] [[Astronomy:Equinox (celestial coordinates)|Equinox J2000.0}} | |
|---|---|
| Constellation | Pictor |
| μ Pic A | |
| Right ascension | 06h 31m 58.31011s[1] |
| Declination | −58° 45′ 13.8114″[1] |
| Apparent magnitude (V) | 5.71[2] |
| μ Pic B | |
| Right ascension | 06h 31m 58.0685s[3] |
| Declination | −58° 45′ 15.4103″[3] |
| Apparent magnitude (V) | 9.43[2] |
| Characteristics | |
| Spectral type | B9 Ve[4] or B9 IVn + A8 V:p?[5] |
| U−B color index | −0.17[6] |
| B−V color index | −0.06[6] |
| Astrometry | |
| μ Pic A | |
| Radial velocity (Rv) | +0.40±1.00[7] km/s |
| Proper motion (μ) | RA: −1.302[1] mas/yr Dec.: +1.637[1] mas/yr |
| Parallax (π) | 5.3553 ± 0.0358[1] mas |
| Distance | 609 ± 4 ly (187 ± 1 pc) |
| Absolute magnitude (MV) | 0.20[8] |
| μ Pic B | |
| Proper motion (μ) | RA: +0.881 mas/yr Dec.: +0.918 mas/yr |
| Parallax (π) | 5.3644 ± 0.0286[3] mas |
| Distance | 608 ± 3 ly (186.4 ± 1.0 pc) |
| Absolute magnitude (MV) | 3.75[8] |
| Details | |
| μ Pic A | |
| Mass | 3.32[1] M☉ |
| Radius | 4.43[1] R☉ |
| Luminosity | 205[1] L☉ |
| Surface gravity (log g) | 3.612[1] cgs |
| Temperature | 10,375[1] K |
| Rotational velocity (v sin i) | 228[9] km/s |
| Age | 258[1] Myr |
| μ Pic B | |
| Mass | 1.18[10] M☉ |
| Radius | 1.26[11] R☉ |
| Luminosity | 5.23[11] L☉ |
| Surface gravity (log g) | 4.25[10] cgs |
| Temperature | 7,770[11] K |
| Other designations | |
| Database references | |
| SIMBAD | μ Pic A |
| μ Pic B | |
μ Pictoris, Latinised as Mu Pictoris, is a binary star[2] 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.[6] Based upon an annual parallax shift of 5.4 mas as seen from Earth,[1] the system is located roughly 610 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[2] 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.[13]
The secondary companion, component B, is a white-hued star of magnitude 9.43[2] 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. The star has a radius of 1.26 R☉ and a luminosity around 5.2 L☉,[11] values unusually low compared to the average for an A8-type dwarf star.[14]
References
- ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940. Gaia DR3 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 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.
- ↑ 3.0 3.1 3.2 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940. Gaia DR3 record for this source at VizieR.
- ↑ 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.
- ↑ 6.0 6.1 6.2 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.
- ↑ 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.
- ↑ 8.0 8.1 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.
- ↑ 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.
- ↑ 10.0 10.1 Anders, F.; Khalatyan, A.; Chiappini, C.; Queiroz, A. B.; Santiago, B. X.; Jordi, C.; Girardi, L.; Brown, A. G. A. et al. (2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy and Astrophysics 628: A94. doi:10.1051/0004-6361/201935765. Bibcode: 2019A&A...628A..94A.
- ↑ 11.0 11.1 11.2 11.3 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ "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.
- ↑ Mamajek, Eric (2 March 2021), A Modern Mean Dwarf Stellar Color and Effective Temperature Sequence, University of Rochester, Department of Physics and Astronomy, http://www.pas.rochester.edu/~emamajek/EEM_dwarf_UBVIJHK_colors_Teff.txt, retrieved 5 July 2021.
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