Zeta1 Lyrae

ζ¹ Lyrae
	Location of ζ Lyrae (circled)
Observation data; Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Lyra
Right ascension	18h 44m 46.35735s
Declination	+37° 36′ 18.4171″
Apparent magnitude (V)	4.37
Characteristics
Spectral type	kA5hF0mF2
U−B color index	+0.17
B−V color index	+0.18
Astrometry
Proper motion (μ)	RA: +29.04 mas/yr ; Dec.: +27.03 mas/yr
Parallax (π)	20.89±0.17 mas
Distance	156 ± 1 ly ; (47.9 ± 0.4 pc)
Absolute magnitude (MV)	+0.94
Orbit
Period (P)	4.3 d
Eccentricity (e)	0.01
Periastron epoch (T)	2440000.723 JD
Argument of periastron (ω); (secondary)	0.00°
Semi-amplitude (K1); (primary)	51.6 km/s
Details
Mass	2.36 M☉
Radius	2.5 R☉
Luminosity	31 L☉
Surface gravity (log g)	3.7±0.1 cgs
Temperature	7914±112 K
Metallicity [Fe/H]	0.38±0.06 dex
Rotational velocity (v sin i)	47 km/s
Age	500 Myr
Other designations
	ζ1 Lyr, 6 Lyr, BD+37°3222, HD 173648, HIP 91971, HR 7056, SAO 67321.
Database references
SIMBAD	data

Zeta¹ Lyrae, Latinized from ζ¹ Lyrae, is a binary star in the northern constellation of Lyra. Based upon an annual parallax shift of 20.89 mas as seen from Earth,^[1] the pair are located about 156 light years from the Sun. It is visible to the naked eye with an apparent visual magnitude of 4.37.^[2]

Observational history

ζ¹ Lyrae was discovered to be a spectroscopic binary by William Wallace Campbell and Heber Doust Curtis in 1905 from photographic plates taken at the Lick Observatory between 1902 and 1904.^[12] The first orbit was calculated by Frank Craig Jordan of Allegheny Observatory in 1910 with results in good agreement with the most recent orbit.^[13]

Several other faint stars within about an arc-minute have been listed as companions, but none are physically associated with ζ¹ Lyrae.^[14]

Binary system

This is a single-lined spectroscopic binary system with an orbital period of 4.3 days and a nearly circular orbit with an eccentricity of 0.01.^[5] The primary, component A, is an Am star with a stellar classification of kA5hF0mF2. This complex notation indicates that the spectral type determined solely from the calcium K line would be A5, the spectral type determined from other metallic lines would be F2, and the type determined from hydrogen lines would be F0.^[3]

Variability

ζ¹ Lyrae appears to be slightly variable, with a frequency of 0.65256 cycles per day and an amplitude of 0.0032 in magnitude.^[15] The star has an estimated 2.36^[6] times the mass of the Sun and around 2.5^[7] times the Sun's radius. The position of this system is associated with an X-ray source with a luminosity of 571.6×10²⁰ W.^[16]

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 Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, SIMBAD, Bibcode:1986EgUBV........0M.
^ ^a ^b Abt, Helmut A.; Morrell, Nidia I. (1995), "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars", Astrophysical Journal Supplement, 99: 135, Bibcode:1995ApJS...99..135A, doi:10.1086/192182.
^ 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 Pourbaix, D.; Tokovinin, A. A.; Batten, A. H.; Fekel, F. C.; Hartkopf, W. I.; et al. (2004), "S_B⁹: The ninth catalogue of spectroscopic binary orbits", Astronomy & Astrophysics, 424 (2): 727–732, arXiv:astro-ph/0406573, Bibcode:2004A&A...424..727P, doi:10.1051/0004-6361:20041213, S2CID 119387088.
^ ^a ^b ^c De Rosa, R. J.; et al. (2013), "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.
^ ^a ^b Pasinetti Fracassini, L. E.; Pastori, L.; Covino, S.; Pozzi, A. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics, 367 (2) (3rd ed.): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
^ McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
^ ^a ^b ^c Prugniel, Ph.; 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.
^ Royer, F.; et al. (October 2002), "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i", Astronomy and Astrophysics, 393 (3): 897–911, arXiv:astro-ph/0205255, Bibcode:2002A&A...393..897R, doi:10.1051/0004-6361:20020943, S2CID 14070763.
^ "* zet01 Lyr", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2017-03-17.
^ Campbell, W. W.; Curtis, H. D. (1905), "A list of nine stars whose radial velocities vary", The Astrophysical Journal, 21: 189, Bibcode:1905ApJ....21..185C, doi:10.1086/141200.
^ Jordan, Frank Craig (1910), "The orbit of ζ¹ Lyrae", Publications of the Allegheny Observatory of the University of Pittsburgh, 1 (17): 115–118, Bibcode:1910PAllO...1..115J.
^ Mason, Brian D.; et al. (December 2001), "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog", The Astronomical Journal, 122 (6): 3466–3471, Bibcode:2001AJ....122.3466M, doi:10.1086/323920.
^ Koen, Chris; Eyer, Laurent (2002), "New periodic variables from the Hipparcos epoch photometry", Monthly Notices of the Royal Astronomical Society, 331 (1): 45–59, arXiv:astro-ph/0112194, Bibcode:2002MNRAS.331...45K, doi:10.1046/j.1365-8711.2002.05150.x, S2CID 10505995.
^ Schröder, C.; Schmitt, J. H. M. M. (November 2007), "X-ray emission from A-type stars", Astronomy and Astrophysics, 475 (2): 677–684, Bibcode:2007A&A...475..677S, doi:10.1051/0004-6361:20077429.

[vanLeeuwen2007-1] ^ ^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.

[Mermilliod1986-2] Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, SIMBAD, Bibcode:1986EgUBV........0M.

[abt-3] Abt, Helmut A.; Morrell, Nidia I. (1995), "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars", Astrophysical Journal Supplement, 99: 135, Bibcode:1995ApJS...99..135A, doi:10.1086/192182.

[Anderson2012-4] 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.

[Pourbaix2004-5] Pourbaix, D.; Tokovinin, A. A.; Batten, A. H.; Fekel, F. C.; Hartkopf, W. I.; et al. (2004), "S_B⁹: The ninth catalogue of spectroscopic binary orbits", Astronomy & Astrophysics, 424 (2): 727–732, arXiv:astro-ph/0406573, Bibcode:2004A&A...424..727P, doi:10.1051/0004-6361:20041213, S2CID 119387088.

[DeRosa2014-6] De Rosa, R. J.; et al. (2013), "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.

[PasinettiFracassini2001-7] Pasinetti Fracassini, L. E.; Pastori, L.; Covino, S.; Pozzi, A. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics, 367 (2) (3rd ed.): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.

[Mcdonald2012-8] McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.

[Prugniel2011-9] Prugniel, Ph.; 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.

[Royer2002-10] Royer, F.; et al. (October 2002), "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i", Astronomy and Astrophysics, 393 (3): 897–911, arXiv:astro-ph/0205255, Bibcode:2002A&A...393..897R, doi:10.1051/0004-6361:20020943, S2CID 14070763.

[SIMBAD-11] "* zet01 Lyr", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2017-03-17.

[Campbell1905-12] Campbell, W. W.; Curtis, H. D. (1905), "A list of nine stars whose radial velocities vary", The Astrophysical Journal, 21: 189, Bibcode:1905ApJ....21..185C, doi:10.1086/141200.

[Jordan1910-13] Jordan, Frank Craig (1910), "The orbit of ζ¹ Lyrae", Publications of the Allegheny Observatory of the University of Pittsburgh, 1 (17): 115–118, Bibcode:1910PAllO...1..115J.

[wds-14] Mason, Brian D.; et al. (December 2001), "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog", The Astronomical Journal, 122 (6): 3466–3471, Bibcode:2001AJ....122.3466M, doi:10.1086/323920.

[koen2002-15] Koen, Chris; Eyer, Laurent (2002), "New periodic variables from the Hipparcos epoch photometry", Monthly Notices of the Royal Astronomical Society, 331 (1): 45–59, arXiv:astro-ph/0112194, Bibcode:2002MNRAS.331...45K, doi:10.1046/j.1365-8711.2002.05150.x, S2CID 10505995.

[Schroeder2007-16] Schröder, C.; Schmitt, J. H. M. M. (November 2007), "X-ray emission from A-type stars", Astronomy and Astrophysics, 475 (2): 677–684, Bibcode:2007A&A...475..677S, doi:10.1051/0004-6361:20077429.

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Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Location of ζ Lyrae (circled)
Constellation	Lyra
Right ascension	18^h 44^m 46.35735^s^[1]
Declination	+37° 36′ 18.4171″^[1]
Apparent magnitude (V)	4.37^[2]
Characteristics
Spectral type	kA5hF0mF2^[3]
U−B color index	+0.17^[2]
B−V color index	+0.18^[2]
Astrometry

Proper motion (μ)	RA: +29.04^[1] mas/yr Dec.: +27.03^[1] mas/yr
Parallax (π)	20.89±0.17 mas^[1]
Distance	156 ± 1 ly (47.9 ± 0.4 pc)
Absolute magnitude (M_V)	+0.94^[4]

Orbit^[5]
Period (P)	4.3 d
Eccentricity (e)	0.01
Periastron epoch (T)	2440000.723 JD
Argument of periastron (ω) (secondary)	0.00°
Semi-amplitude (K₁) (primary)	51.6 km/s
Details

Mass	2.36^[6] `M`_☉
Radius	2.5^[7] `R`_☉
Luminosity	31^[8] `L`_☉
Surface gravity (log g)	3.7±0.1^[9] cgs
Temperature	7914±112^[9] K
Metallicity [Fe/H]	0.38±0.06^[9] dex
Rotational velocity (v sin i)	47^[10] km/s
Age	500^[6] Myr

Other designations
ζ¹ Lyr, 6 Lyr, BD+37°3222, HD 173648, HIP 91971, HR 7056, SAO 67321.^[11]
Database references
SIMBAD	data

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