From Wikipedia, the free encyclopedia
Aging red giant star in the constellation Hercules
98 Herculis is a single
[7]
star located approximately 590
[1]
light years from the Sun in the northern
constellation
Hercules . It is visible to the naked eye as a dim, red-hued point of light with an
apparent visual magnitude of 4.96.
[2] The brightness of the star is diminished by an
extinction of 0.19 due to
interstellar dust .
[8] The star is moving closer to the Earth with a heliocentric
radial velocity of −19 km/s.
[2]
This is an aging
red giant star on the
asymptotic giant branch
[9] with a
stellar classification of M3-SIII,
[3] where the suffix notation indicating this is an
S-type star . It is a mild
barium star with an intensity class of 0.2,
[10]
[4] and is a suspected
variable star , although Percy and Shepherd (1992) were unable to confirm this.
[11] With the hydrogen at its
core exhausted, the star has expanded to around 85
[1] times the
Sun's radius . It is radiating 1,330
[1] times the
luminosity of the Sun from its swollen
photosphere at an
effective temperature of 3,772 K.
[1]
References
^
a
b
c
d
e
f
g
h
i
j
k
l
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 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 Lu, Phillip K. (1991), "Taxonomy of barium stars", Astronomical Journal , 101 : 2229,
Bibcode :
1991AJ....101.2229L ,
doi :
10.1086/115845 .
^ Samus, N. N.; Durlevich, O. V.; et al. (2009), "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)", VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S , 1 : B/gcvs,
Bibcode :
2009yCat....102025S .
^
"98 Her" .
SIMBAD .
Centre de données astronomiques de Strasbourg . Retrieved 2019-06-17 .
^ 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 .
^ Famaey, B.; et al. (January 2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics , 430 (1): 165–186,
arXiv :
astro-ph/0409579 ,
Bibcode :
2005A&A...430..165F ,
doi :
10.1051/0004-6361:20041272 ,
S2CID
17804304 .
^ Eggen, Olin J. (July 1992), "Asymptotic giant branch stars near the sun", Astronomical Journal , 104 (1): 275–313,
Bibcode :
1992AJ....104..275E ,
doi :
10.1086/116239 .
^ Gomez, A. E.; et al. (1997), "Absolute magnitudes and kinematics of barium stars", Astronomy and Astrophysics , 319 : 881,
Bibcode :
1997A&A...319..881G .
^ Percy, J. R.; Shepherd, C. W. (October 1992), "A Photometric Survey of Small-Amplitude Red Variables", Information Bulletin on Variable Stars , 3792 : 1,
Bibcode :
1992IBVS.3792....1P .