From Wikipedia, the free encyclopedia
Star in the constellation Hercules
45 Herculis is a solitary
[15]
variable star in the northern
constellation
Hercules . It has the
Bayer designation l Herculis and the
variable star designation V776 Herculis . The
Flamsteed designation for this star comes from the publication Historia Coelestis Britannica by
John Flamsteed . It is the 45th star in Flamsteed list of stars in the constellation Hercules, and is visible to the naked eye with a baseline
apparent visual magnitude of 5.22.
[3]
Parallax measurements show this star to be about 400
light-years away from the
Solar System .
[2] It is moving closer to the Earth with a heliocentric
radial velocity of −16 km/s.
[8]
Cowley et at. (1969) assigned this object a classification of B9p Cr ,
[5] while Abt and Morrell (1995) found a class of A1 Vp Si .
[4] Both indicate this is a
late
B- or
early
A-type
chemically peculiar , or
Ap star , with abundance anomalies in chromium or silicon. It is an
Alpha2 Canum Venaticorum variable that ranges in visual magnitude from 5.21 down to 5.27.
[7] The star has 2.9
[10] times the
mass of the Sun and 4.9
[11] times the
Sun's radius . It is radiating 120
[9] times the
Sun's luminosity from its
photosphere at an
effective temperature of 9,333 K.
[12]
References
^ Burke, E. W. Jr.; Barr, T. H. (June 1981).
"Photometric UBV period study of eight AP stars" . Publications of the Astronomy Society of the Pacific . 93 : 344–350.
Bibcode :
1981PASP...93..344B .
doi :
10.1086/130836 .
S2CID
122946991 . Retrieved 10 January 2022 .
^
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 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 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 .
^
a
b Cowley, A.; et al. (April 1969). "A study of the bright A stars. I. A catalogue of spectral classifications". Astronomical Journal . 74 : 375–406.
Bibcode :
1969AJ.....74..375C .
doi :
10.1086/110819 .
^
a
b Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data .
Bibcode :
1986EgUBV........0M .
^
a
b Samus, N. N.; et al. (2017). "General Catalogue of Variable Stars". Astronomy Reports . 5.1. 61 (1): 80–88.
Bibcode :
2017ARep...61...80S .
doi :
10.1134/S1063772917010085 .
S2CID
125853869 .
^
a
b Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Carnegie Institute Washington D.C. Publication .
Bibcode :
1953GCRV..C......0W .
^
a
b
c 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 Netopil, Martin; Paunzen, Ernst; Huemmerich, Stefan; Bernhard, Klaus (July 2017). "An Investigation of the Rotational Properties of Magnetic Chemically Peculiar Stars". Monthly Notices of the Royal Astronomical Society . 468 (3): 2745–2756.
arXiv :
1703.05218 .
Bibcode :
2017MNRAS.468.2745N .
doi :
10.1093/mnras/stx674 .
S2CID
119215348 .
^
a
b Shulyak, D.; et al. (2014). "Interferometry of chemically peculiar stars: Theoretical predictions versus modern observing facilities". Monthly Notices of the Royal Astronomical Society . 443 (2): 1629.
arXiv :
1406.6093 .
Bibcode :
2014MNRAS.443.1629S .
doi :
10.1093/mnras/stu1259 .
S2CID
96452769 .
^
a
b
c
d Wolff, Sidney Carne (October 1967).
"A Spectroscopic and Photometric Study of the AP Stars" . Astrophysical Journal Supplement . 15 : 21.
Bibcode :
1967ApJS...15...21W .
doi :
10.1086/190162 .
^ 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 : 897–911.
arXiv :
astro-ph/0205255 .
Bibcode :
2002A&A...393..897R .
doi :
10.1051/0004-6361:20020943 .
S2CID
14070763 .
^
"45 Her" .
SIMBAD .
Centre de données astronomiques de Strasbourg . Retrieved 2019-06-14 .
^ 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 .