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Red giant star in the constellation Eridanus
Pi Eridani,
Latinized from π Eridani, is a
star in the
constellation
Eridanus. It has an
apparent visual magnitude of 4.40,
[2] which is bright enough to be seen on a dark, clear night. Based upon
parallax measurements, it is located roughly 480
light years from the
Sun.
This is an
evolved
red giant star with a
stellar classification of M1 III,
[5] and is currently on the
asymptotic giant branch.
[4] It is a
slow irregular variable type LB that can increase in magnitude up to 4.38.
[3]
[11] The measured
angular diameter of this star is 4.8±0.5
mas.
[12] At the estimated distance of Pi Eridani, this yields a physical size of about 77 times the
radius of the Sun.
[8] It shines with 1,123
[9] times the luminosity of the Sun from an
outer atmosphere at an
effective temperature of 3,841 K.
[9]
References
- ^
a
b
c
d
e 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d Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data,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
c Samus, N. N.; Durlevich, O. V.; et al. (2007),
Combined General Catalogue of Variable Stars (GCVS4.2), retrieved 2016-09-30. VizieR On-line Data Catalog:
B/gcvs. CS1 maint: postscript (
link)
- ^
a
b Eggen, O. J. (1992), "Asymptotic giant branch stars near the sun", The Astronomical Journal, 104: 275,
Bibcode:
1992AJ....104..275E,
doi:
10.1086/116239.
- ^
a
b Houk, N.; Smith-Moore, M. (1988), Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars, vol. 4,
Bibcode:
1988mcts.book.....H.
-
^ Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771,
arXiv:
1606.08053,
Bibcode:
2006AstL...32..759G,
doi:
10.1134/S1063773706110065,
S2CID
119231169.
-
^ 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 Lang, Kenneth R. (2006),
Astrophysical formulae, Astronomy and astrophysics library, vol. 1 (3 ed.),
Birkhäuser,
ISBN
3-540-29692-1. The radius (R*) is given by:
- ^
a
b
c
d 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.
-
^
"* pi. Eri".
SIMBAD.
Centre de données astronomiques de Strasbourg. Retrieved 2016-10-11.
{{
cite web}}: CS1 maint: postscript (
link)
-
^ Mennessier, M. O.; et al. (August 2001), "Long period variable stars: galactic populations and infrared luminosity calibrations", Astronomy and Astrophysics, 374 (3): 968–979,
arXiv:
astro-ph/0105552,
Bibcode:
2001A&A...374..968M,
doi:
10.1051/0004-6361:20010764,
S2CID
15721872.
-
^ Richichi, A.; Percheron, I. (May 2005), "First results from the ESO VLTI calibrators program", Astronomy and Astrophysics, 434 (3): 1201–1209,
arXiv:
astro-ph/0501532,
Bibcode:
2005A&A...434.1201R,
doi:
10.1051/0004-6361:20042257,
S2CID
2847613.
