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Star in the constellation Crater
Gamma Crateris is a
binary star
[7] system, divisible with a small amateur
telescope ,
[14] and located at the center of the southern
constellation of
Crater . It is visible to the naked eye with an
apparent visual magnitude of 4.06.
[2] With an annual
parallax shift of 39.62
mas as seen from Earth, this star is located 82.3
light years from the
Sun . Based upon the motion of this system through space, it is a potential member of the
Castor Moving Group .
[15]
The star was confirmed by Gabriel Cristian Neagu and Jan Ovidiu Tercu as a variable of DSCT type. The variability has an amplitude of 0.001 magnitudes and a main period of 0.03647 d (52.52 min). The variability was discovered during the datamining activity with the goal of increasing the student's investigative competences.
[16]
The primary, component A, is a white-hued
A-type main sequence star of
apparent visual magnitude 4.08 with a
stellar classification of A9 V.
[3] The star has an estimated 1.81
[7] times the
mass of the Sun and around 1.3
[8] times the
Sun's radius . It is about 757
[10] million years old and is spinning with a
projected rotational velocity of 144 km/s.
[12] The primary is radiating 18.8
[9] times the
solar luminosity from its
outer atmosphere at an
effective temperature of 8,020 K.
[10] Based upon the detection of an
infrared excess , the star may host an orbiting
debris disk .
[9] However, this finding remains in doubt.
[17]
The companion, component B, is a magnitude 9.6 star with an estimated mass 75% that of the Sun. As of 2010, the companion was located at an
angular separation of 4.98
arc seconds along a
position angle of 93.1° relative to the primary. This is equivalent to a
projected separation of 125.6
AU .
[7] This star may be the source of the
X-ray emission detected coming from this system.
[18]
References
^
a
b
c
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^
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d Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data ,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 ,
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^
a
b Houk, Nancy; Smith-Moore, M. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars , vol. 4, Ann Arbor: Dept. of Astronomy, University of Michigan,
Bibcode :
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^ 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,
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S2CID
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^
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arXiv :
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Bibcode :
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doi :
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Gaia DR2 record for this source at
VizieR .
^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters , 38 (5): 331,
arXiv :
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^
a
b
c
d
e 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 :
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Bibcode :
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doi :
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S2CID
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^
a
b Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics , 367 (3rd ed.): 521–524,
arXiv :
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Bibcode :
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doi :
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S2CID
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^
a
b
c Hales, Antonio S.; et al. (April 2017), "Atomic gas in debris discs", Monthly Notices of the Royal Astronomical Society , 466 (3): 3582–3593,
arXiv :
1612.05465 ,
Bibcode :
2017MNRAS.466.3582H ,
doi :
10.1093/mnras/stw3274 ,
S2CID
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^
a
b
c
d
e 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 :
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Bibcode :
2015ApJ...804..146D ,
doi :
10.1088/0004-637X/804/2/146 ,
S2CID
33401607 .
^ Saffe, C.; Gómez, M.; Pintado, O.; González, E. (October 2008), "Spectroscopic metallicities of Vega-like stars", Astronomy and Astrophysics , 490 (1): 297–305,
arXiv :
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Bibcode :
2008A&A...490..297S ,
doi :
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S2CID
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^
a
b Royer, F.; et al. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics , 463 (2): 671–682,
arXiv :
astro-ph/0610785 ,
Bibcode :
2007A&A...463..671R ,
doi :
10.1051/0004-6361:20065224 ,
S2CID
18475298 .
^
"gam Crt" .
SIMBAD .
Centre de données astronomiques de Strasbourg . Retrieved 2017-03-02 . {{
cite web }}
: CS1 maint: postscript (
link )
^ Monks, Neale (2010),
Go-To Telescopes Under Suburban Skies , The Patrick Moore Practical Astronomy Series,
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ISBN
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^ Nakajima, Tadashi; et al. (September 2010), "Potential Members of Stellar Kinematical Groups within 20 pc of the Sun", The Astronomical Journal , 140 (3): 713–722,
Bibcode :
2010AJ....140..713N ,
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^
"VSX : Detail for gam Crt" . www.aavso.org . Retrieved 2021-03-31 .
^ Ertel, S.; et al. (October 2014), "A near-infrared interferometric survey of debris-disk stars. IV. An unbiased sample of 92 southern stars observed in H band with VLTI/PIONIER", Astronomy & Astrophysics , 570 : 20,
arXiv :
1409.6143 ,
Bibcode :
2014A&A...570A.128E ,
doi :
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S2CID
9594917 , A128.
^ Schröder, C.; Schmitt, J. H. M. M. (November 2007), "X-ray emission from A-type stars", Astronomy and Astrophysics , 475 (2): 677–684,
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External links
Kaler, James B. (April 15, 2011),
"Gamma Crateris" , Stars , University of Illinois, retrieved 2017-03-03 .