49 Orionis

49 Orionis
	Location of 49 Orionis (circled)
Observation data; Epoch J2000 Equinox J2000
Constellation	Orion
Right ascension	05h 38m 53.08332s
Declination	−07° 12′ 46.1667″
Apparent magnitude (V)	4.80
Characteristics
Evolutionary stage	main sequence
Spectral type	A4Vn
U−B color index	+0.11
B−V color index	+0.13
Astrometry
Radial velocity (Rv)	−5.30 km/s
Proper motion (μ)	RA: −15.562 mas/yr ; Dec.: −50.613 mas/yr
Parallax (π)	23.1346 ± 0.2801 mas
Distance	141 ± 2 ly ; (43.2 ± 0.5 pc)
Absolute magnitude (MV)	1.52
Details
Mass	1.78 M☉
Radius	2.0 R☉
Luminosity	22 L☉
Surface gravity (log g)	4.06 cgs
Temperature	8,416±286 K
Rotational velocity (v sin i)	186 km/s
Age	284 Myr
Other designations
	d Ori, 49 Ori, BD−07°1142, GC 7039, GJ 9187, HD 37507, HIP 26563, HR 1937, SAO 132411
Database references
SIMBAD	data

49 Orionis is a single^[10] star in the equatorial constellation of Orion. It has the Bayer designation d Orionis, while 49 Orionis is the Flamsteed designation. This object is visible to the naked eye as a faint, white-hued star with an apparent visual magnitude of 4.80.^[2] It is located 141 light years away from the Sun based on parallax,^[1] but is drifting closer with a radial velocity of −5 km/s.^[4]

In the past 49 Orionis was reported as a spectroscopic binary and an orbit was computed with a period of 445.74 days and an eccentricity of 0.549.^[11] But it was later determined to be single.^[10]

This object is an A-type main-sequence star with a stellar classification of A4Vn,^[3] where the 'n' suffix indicates broadened "nebulous" lines caused by rapid rotation. It is around 284^[6] million years old with a projected rotational velocity of 186 km/s.^[8] This spin is giving the star an oblate shape with an equatorial bulge that is an estimated 8% larger than the polar radius.^[12] The star has 1.8^[6] times the mass of the Sun and double^[7] the Sun's radius. It is radiating 22^[8] times the Sun's luminosity from its photosphere at an effective temperature of 8,416 K.^[6]

References

^ ^a ^b ^c ^d ^e ^f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
^ ^a ^b ^c ^d Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
^ ^a ^b Gray, R. O.; Garrison, R. F. (July 1989). "The Late A-Type Stars: Refined MK Classification, Confrontation with Stroemgren Photometry, and the Effects of Rotation". Astrophysical Journal Supplement. 70: 623. Bibcode:1989ApJS...70..623G. doi:10.1086/191349.
^ ^a ^b Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
^ Anderson, 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. S2CID 119257644. Vizier catalog entry
^ ^a ^b ^c ^d ^e ^f ^g David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID 33401607.
^ ^a ^b Allende Prieto, C.; Lambert, D. L. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures". Astronomy and Astrophysics. 352: 555–562. arXiv:astro-ph/9911002. Bibcode:1999A&A...352..555A. Vizier catalog entry
^ ^a ^b ^c ^d Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars". Astronomy & Astrophysics. 537: A120. arXiv:1201.2052. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691. S2CID 55586789. Vizier catalog entry
^ "49 Ori". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-07-29.
^ ^a ^b De Rosa, R. J.; et al. (2014). "The VAST Survey - III. The multiplicity of A-type stars within 75 pc". Monthly Notices of the Royal Astronomical Society. 437 (2): 1216. arXiv:1311.7141. Bibcode:2014MNRAS.437.1216D. doi:10.1093/mnras/stt1932. S2CID 88503488.
^ Abt, Helmut A. (June 1965). "The Frequency of Binaries among Normal A-Type Stars". Astrophysical Journal Supplement. 11: 429. Bibcode:1965ApJS...11..429A. doi:10.1086/190120.
^ Belle, G. T. (2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review, 20 (1): 51, arXiv:1204.2572, Bibcode:2012A&ARv..20...51V, doi:10.1007/s00159-012-0051-2, S2CID 119273474.

Zdroj:https://en.wikipedia.org?pojem=49_Orionis
Text je dostupný za podmienok Creative Commons Attribution/Share-Alike License 3.0 Unported; prípadne za ďalších podmienok. Podrobnejšie informácie nájdete na stránke Podmienky použitia.

[GaiaDR2-1] ^ ^a ^b ^c ^d ^e ^f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.

[Ducati2002-2] Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.

[Gray1989-3] Gray, R. O.; Garrison, R. F. (July 1989). "The Late A-Type Stars: Refined MK Classification, Confrontation with Stroemgren Photometry, and the Effects of Rotation". Astrophysical Journal Supplement. 70: 623. Bibcode:1989ApJS...70..623G. doi:10.1086/191349.

[Gontcharov2006-4] Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.

[XHIP-5] Anderson, 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. S2CID 119257644. Vizier catalog entry

[David2015-6] ^ ^a ^b ^c ^d ^e ^f ^g David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID 33401607.

[AllendePrieto-7] Allende Prieto, C.; Lambert, D. L. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures". Astronomy and Astrophysics. 352: 555–562. arXiv:astro-ph/9911002. Bibcode:1999A&A...352..555A. Vizier catalog entry

[Zorec2012-8] Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars". Astronomy & Astrophysics. 537: A120. arXiv:1201.2052. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691. S2CID 55586789. Vizier catalog entry

[SIMBAD-9] "49 Ori". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-07-29.

[derosa2014-10] De Rosa, R. J.; et al. (2014). "The VAST Survey - III. The multiplicity of A-type stars within 75 pc". Monthly Notices of the Royal Astronomical Society. 437 (2): 1216. arXiv:1311.7141. Bibcode:2014MNRAS.437.1216D. doi:10.1093/mnras/stt1932. S2CID 88503488.

[Abt1965-11] Abt, Helmut A. (June 1965). "The Frequency of Binaries among Normal A-Type Stars". Astrophysical Journal Supplement. 11: 429. Bibcode:1965ApJS...11..429A. doi:10.1086/190120.

[belle2012-12] Belle, G. T. (2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review, 20 (1): 51, arXiv:1204.2572, Bibcode:2012A&ARv..20...51V, doi:10.1007/s00159-012-0051-2, S2CID 119273474.

[1]

[2]

[3]

[4]

[5]

[6]

[7]

[8]

[9]

[10]

[11]

[12]

Observation data Epoch J2000 Equinox J2000
Location of 49 Orionis (circled)
Constellation	Orion
Right ascension	05^h 38^m 53.08332^s^[1]
Declination	−07° 12′ 46.1667″^[1]
Apparent magnitude (V)	4.80^[2]
Characteristics
Evolutionary stage	main sequence
Spectral type	A4Vn^[3]
U−B color index	+0.11^[2]
B−V color index	+0.13^[2]
Astrometry

Radial velocity (R_v)	−5.30^[4] km/s
Proper motion (μ)	RA: −15.562^[1] mas/yr Dec.: −50.613^[1] mas/yr
Parallax (π)	23.1346 ± 0.2801 mas^[1]
Distance	141 ± 2 ly (43.2 ± 0.5 pc)
Absolute magnitude (M_V)	1.52^[5]

Details

Mass	1.78^[6] `M`_☉
Radius	2.0^[7] `R`_☉
Luminosity	22^[8] `L`_☉
Surface gravity (log g)	4.06^[6] cgs
Temperature	8,416±286^[6] K
Rotational velocity (v sin i)	186^[8] km/s
Age	284^[6] Myr

Other designations
d Ori, 49 Ori, BD−07°1142, GC 7039, GJ 9187, HD 37507, HIP 26563, HR 1937, SAO 132411^[9]
Database references
SIMBAD	data