27 Arietis - Wiki slovník

27 Arietis
Observation data; Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Aries
Right ascension	02h 30m 54.39715s
Declination	+17° 42′ 13.8908″
Apparent magnitude (V)	6.21
Characteristics
Spectral type	G8 III-IV Fe-2
B−V color index	0.908±0.002
Astrometry
Radial velocity (Rv)	−122.71±0.28 km/s
Proper motion (μ)	RA: +33.774 mas/yr ; Dec.: −82.912 mas/yr
Parallax (π)	11.6403 ± 0.1172 mas
Distance	280 ± 3 ly ; (85.9 ± 0.9 pc)
Absolute magnitude (MV)	1.48
Orbit
Period (P)	130.706±0.008 d
Eccentricity (e)	0.366±0.007
Periastron epoch (T)	53,480.1±0.4 MJD
Argument of periastron (ω); (secondary)	275.5±0.7°
Semi-amplitude (K1); (primary)	5.98±0.05 km/s
Details
Mass	1.29 M☉
Radius	7.04+0.29; −0.28 R☉
Luminosity	28.43 L☉
Surface gravity (log g)	2.77±0.21 cgs
Temperature	4,788±49 K
Metallicity	−0.65±0.02 dex
Rotational velocity (v sin i)	1.6 km/s
Age	5.44 Gyr
Other designations
	27 Ari, BD+17°380, FK5 1069, HD 15596, HIP 11698, HR 731, SAO 92983
Database references
SIMBAD	data

27 Arietis is a binary star^[4] system in the northern constellation of Aries. 27 Arietis is the Flamsteed designation. It is a dim, yellow-hued star that is close to the lower limit of what can be viewed with the naked eye, having an apparent visual magnitude is 6.21.^[2] The annual parallax shift of 11.64±0.12 mas^[1] corresponds to a physical distance of approximately 280 light-years (86 parsecs) from Earth. It is advancing closer to the Earth with a heliocentric radial velocity of −122.7 km/s, and may come as close as 84 light-years in around 643,000 years.^[2]

This appears to be a single-lined spectroscopic binary system with an orbital period of 130.7 days and an eccentricity of 0.366. It has an "a sin i" value of 10.00 ± 0.08 Gm (0.06685 ± 0.00053 AU), where a is the semimajor axis and i is the inclination to the line of sight from the Earth. This value provides a lower bound on the actual semimajor axis.^[4] The visible component has a stellar classification of G8 III-IV Fe-2,^[3] displaying mixed spectral traits of an evolved subgiant and a giant star, with a strong underabundance of iron. The CN bands of this star are very weak.^[4]

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 ^e ^f ^g ^h 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.
^ ^a ^b Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.
^ ^a ^b ^c ^d ^e Griffin, R. F. (October 2011), "Spectroscopic binary orbits from photoelectric radial velocities - Paper 220: 60 Piscium, 27 Arietis, EZ Ursae Majoris, and 4 Equulei", The Observatory, 131 (5): 294–314, Bibcode:2011Obs...131..294G.
^ ^a ^b ^c Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal, 150 (3), 88, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88, S2CID 118505114.
^ Prugniel, P.; et al. (2011), "The atmospheric parameters and spectral interpolator for the MILES stars", Astronomy & Astrophysics, 531: A165, arXiv:1104.4952, Bibcode:2011A&A...531A.165P, doi:10.1051/0004-6361/201116769, S2CID 54940439.
^ "27 Ari". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-06-02.

External links

Zdroj:https://en.wikipedia.org?pojem=27_Arietis
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[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.

[Anderson2012-2] ^ ^a ^b ^c ^d ^e ^f ^g ^h 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.

[Keenan1989-3] Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.

[Griffin2011-4] Griffin, R. F. (October 2011), "Spectroscopic binary orbits from photoelectric radial velocities - Paper 220: 60 Piscium, 27 Arietis, EZ Ursae Majoris, and 4 Equulei", The Observatory, 131 (5): 294–314, Bibcode:2011Obs...131..294G.

[Luck2015-5] Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal, 150 (3), 88, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88, S2CID 118505114.

[prugniel2011-6] Prugniel, P.; et al. (2011), "The atmospheric parameters and spectral interpolator for the MILES stars", Astronomy & Astrophysics, 531: A165, arXiv:1104.4952, Bibcode:2011A&A...531A.165P, doi:10.1051/0004-6361/201116769, S2CID 54940439.

[SIMBAD-7] "27 Ari". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-06-02.

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Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Aries
Right ascension	02^h 30^m 54.39715^s^[1]
Declination	+17° 42′ 13.8908″^[1]
Apparent magnitude (V)	6.21^[2]
Characteristics
Spectral type	G8 III-IV Fe-2^[3]
B−V color index	0.908±0.002^[2]
Astrometry

Radial velocity (R_v)	−122.71±0.28^[2] km/s
Proper motion (μ)	RA: +33.774^[1] mas/yr Dec.: −82.912^[1] mas/yr
Parallax (π)	11.6403 ± 0.1172 mas^[1]
Distance	280 ± 3 ly (85.9 ± 0.9 pc)
Absolute magnitude (M_V)	1.48^[2]

Orbit^[4]
Period (P)	130.706±0.008 d
Eccentricity (e)	0.366±0.007
Periastron epoch (T)	53,480.1±0.4 MJD
Argument of periastron (ω) (secondary)	275.5±0.7°
Semi-amplitude (K₁) (primary)	5.98±0.05 km/s
Details

Mass	1.29^[5] `M`_☉
Radius	7.04+0.29 −0.28 `R`_☉
Luminosity	28.43^[2] `L`_☉
Surface gravity (log g)	2.77±0.21^[6] cgs
Temperature	4,788±49^[5] K
Metallicity	−0.65±0.02^[2] dex
Rotational velocity (v sin i)	1.6^[4] km/s
Age	5.44^[5] Gyr

Other designations
27 Ari, BD+17°380, FK5 1069, HD 15596, HIP 11698, HR 731, SAO 92983^[7]
Database references
SIMBAD	data