| Observation data Epoch J2000.0 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 mas [1] |
| 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
- ^ a b c d e f van 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, S2CID 18759600.
- ^ a b c d 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.
- ^ a b c d 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, S2CID 14878976.
- ^ a b c 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, arXiv: 1003.0618, Bibcode: 2010MNRAS.405.2439O, doi: 10.1111/j.1365-2966.2010.16609.x, S2CID 119209332.
- ^ a b c Corbally, C. J. (1984), "Close visual binaries. I - MK classifications", Astrophysical Journal Supplement Series, 55: 657, Bibcode: 1984ApJS...55..657C, doi: 10.1086/190973.
- ^ 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, arXiv: 1208.3048, Bibcode: 2012A&A...546A..61D, doi: 10.1051/0004-6361/201219219, S2CID 59451347, A61.
- ^ Corbally, C. J. (December 1984), "Close visual binaries. III - Parameters and evolutionary status", Astronomical Journal, 89: 1887–1896, Bibcode: 1984AJ.....89.1887C, doi: 10.1086/113700.
- ^ a b c d Zorec, J.; Royer, F. (January 2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv: 1201.2052, Bibcode: 2012A&A...537A.120Z, doi: 10.1051/0004-6361/201117691, S2CID 55586789.
-
^
"mu. Pic".
SIMBAD.
Centre de données astronomiques de Strasbourg. Retrieved 2017-08-08.
{{ cite web}}: CS1 maint: postscript ( link) - ^ 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, Bibcode: 1995MNRAS.277.1547B, doi: 10.1093/mnras/277.4.1547.
| Observation data Epoch J2000.0 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 mas [1] |
| 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
- ^ a b c d e f van 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, S2CID 18759600.
- ^ a b c d 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.
- ^ a b c d 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, S2CID 14878976.
- ^ a b c 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, arXiv: 1003.0618, Bibcode: 2010MNRAS.405.2439O, doi: 10.1111/j.1365-2966.2010.16609.x, S2CID 119209332.
- ^ a b c Corbally, C. J. (1984), "Close visual binaries. I - MK classifications", Astrophysical Journal Supplement Series, 55: 657, Bibcode: 1984ApJS...55..657C, doi: 10.1086/190973.
- ^ 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, arXiv: 1208.3048, Bibcode: 2012A&A...546A..61D, doi: 10.1051/0004-6361/201219219, S2CID 59451347, A61.
- ^ Corbally, C. J. (December 1984), "Close visual binaries. III - Parameters and evolutionary status", Astronomical Journal, 89: 1887–1896, Bibcode: 1984AJ.....89.1887C, doi: 10.1086/113700.
- ^ a b c d Zorec, J.; Royer, F. (January 2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv: 1201.2052, Bibcode: 2012A&A...537A.120Z, doi: 10.1051/0004-6361/201117691, S2CID 55586789.
-
^
"mu. Pic".
SIMBAD.
Centre de données astronomiques de Strasbourg. Retrieved 2017-08-08.
{{ cite web}}: CS1 maint: postscript ( link) - ^ 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, Bibcode: 1995MNRAS.277.1547B, doi: 10.1093/mnras/277.4.1547.