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Star in the constellation Cassiopeia
υ1 Cassiopeiae is the bright star in the lower right. The bright star in the upper left is υ2 Cassiopeiae.
Upsilon1 Cassiopeiae (υ1 Cassiopeiae) is an
astrometric binary
[9] star system in the northern
constellation of
Cassiopeia . It is visible to the naked eye with an
apparent visual magnitude of 4.82.
[2] Based upon an annual
parallax shift of 9.93
mas as seen from Earth,
[1] this system is located about 330
light years from the
Sun .
The visible component is an
evolved
K-type
giant star with a
stellar classification of K2 III.
[3] With an estimated age of 4.75 billion years,
[5] it is a
red clump star that is generating energy through the fusion of helium at its core.
[10] The measured
angular diameter , after correction for
limb darkening , is 1.97± 0.02
mas .
[11] At the estimated distance of the star, this yields a physical size of about 21 times the
radius of the Sun .
[6] It has 1.39 times the
mass of the Sun and is radiating 174 times the
Sun's luminosity from its expanded
photosphere at an
effective temperature of 4,422 K.
[5]
There is a magnitude 12.50
visual companion at an
angular separation of 17.80
arc seconds along a
position angle of 61°, as of 2003. A more distant magnitude 12.89 companion lies at a separation of 93.30 arc seconds along a position angle of 125°, as measured in 2003. Neither star appears to be physically associated with υ1 Cas.
[12]
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 Argue, A. N. (1966), "UBV photometry of 550 F, G and K type stars", Monthly Notices of the Royal Astronomical Society , 133 (4): 475,
Bibcode :
1966MNRAS.133..475A ,
doi :
10.1093/mnras/133.4.475 .
^
a
b Eggen, O. J. (1962), "Space-velocity vectors for 3483 stars with proper motion and radial velocity", Royal Observatory Bulletin , 51 : 79,
Bibcode :
1962RGOB...51...79E .
^
a
b
c
d Soubiran, C.; et al. (2008), "Vertical distribution of Galactic disk stars. IV. AMR and AVR from clump giants", Astronomy and Astrophysics , 480 (1): 91–101,
arXiv :
0712.1370 ,
Bibcode :
2008A&A...480...91S ,
doi :
10.1051/0004-6361:20078788 ,
S2CID
16602121 .
^
a
b
c
d
e
f Luck, R. Earle (September 2015), "Abundances in the Local Region. I. G and K Giants", The Astronomical Journal , 150 (3): 23,
arXiv :
1507.01466 ,
Bibcode :
2015AJ....150...88L ,
doi :
10.1088/0004-6256/150/3/88 ,
S2CID
118505114 , 88.
^
a
b Lang, Kenneth R. (2006),
Astrophysical formulae , Astronomy and astrophysics library, vol. 1 (3rd ed.),
Birkhäuser ,
ISBN
3-540-29692-1 . The radius (R* ) is given by:
2
⋅
R
∗
=
(
101
⋅
1.97
⋅
10
−
3
)
AU
0.0046491
AU
/
R
⨀
≈
42.8
⋅
R
⨀
{\displaystyle {\begin{aligned}2\cdot R_{*}&={\frac {(101\cdot 1.97\cdot 10^{-3})\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 42.8\cdot R_{\bigodot }\end{aligned}}}
^ De Medeiros, J. R.; et al. (November 2000), "Rotation and lithium in single giant stars", Astronomy and Astrophysics , 363 : 239–243,
arXiv :
astro-ph/0010273 ,
Bibcode :
2000A&A...363..239D .
^
"ups01 Cas" .
SIMBAD .
Centre de données astronomiques de Strasbourg . Retrieved 2017-08-30 .
^ 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 .
^ Valentini, M.; Munari, U. (November 2010),
"A spectroscopic survey of faint, high-Galactic-latitude red clump stars. I. The high resolution sample" , Astronomy and Astrophysics , 522 : A79,
arXiv :
1007.0207 ,
Bibcode :
2010A&A...522A..79V ,
doi :
10.1051/0004-6361/201014870 ,
S2CID
119156545 . [
permanent dead link ]
^ Richichi, A.; et al. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics , 431 (2): 773–777,
Bibcode :
2005A&A...431..773R ,
doi :
10.1051/0004-6361:20042039 .
^ Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal , 122 (6): 3466,
Bibcode :
2001AJ....122.3466M ,
doi :
10.1086/323920 .