Alpha Antliae

from Wikipedia, the free encyclopedia
Star
Alpha Antliae
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation Air pump
Right ascension 10 h 27 m 9.1 s
declination -31 ° 04 ′ 4 ″
Apparent brightness 4.22 to 4.29 mag
Typing
B − V color index 1.45 
U − B color index 1.63 
R − I index 0.79 
Spectral class K4 III
Variable star type supposed 
Astrometry
Radial velocity (12.2 ± 2) km / s
parallax (10.0734 ± 0.3348)  mas
distance (324 ± 10)  ly
(99 ± 3)  pc  
Visual absolute brightness M vis approx. −0.7 mag
Proper movement 
Rec. Share: (−83.335 ± 0.492)  mas / a
Dec. portion: (8.269 ± 0.475)  mas / a
Physical Properties
Dimensions 2.2  M ☉
radius 53  R ☉
Luminosity

480 to 555  L ☉

Effective temperature 3990  K
Other names
and catalog entries
Bayer name α Antliae
Bright Star Catalog HR 4104 [1]
Henry Draper Catalog HD 90610 [2]
Hipparcos catalog HIP 51172 [3]
SAO catalog SAO 201405 [4]
annotation
  1. ↑ Calculated from apparent brightness and distance.

α Antliae ( Alpha Antliae , short α Ant ) is the brightest star in the constellation Air Pump . Nevertheless, it is a relatively faint object of the fourth magnitude . The distance of this orange giant star of spectral class K4 from Earth is about 324 light years . It is believed that its apparent magnitude fluctuates with a small amplitude between 4.22 mag and 4.29 mag. Its surface temperature is about 4000 Kelvin, its mass probably about 2.2 solar masses and its luminosity about 480 to 555 times that of the sun. The approximately one billion year old star is likely to have already burned its hydrogen supply to carbon via helium and is in the process of becoming brighter and developing into a variable Mira star, only to end up as a white dwarf later .

Individual evidence

  1. ↑ a b c d Gaia data release 2 ( Gaia DR2 ), April 2018
  2. ↑ NSV 4862, database entry, New Catalog of Suspected Variable Stars, the improved version , Sternberg Astronomical Institute, Moscow, Russia.
  3. ↑ a b c D. Hoffleit, WH Warren, Jr .: HR 4104 . In: The Bright Star Catalog (5th revised edition) . Center de Données astronomiques de Strasbourg .
  4. ^ Hipparcos catalog (ESA 1997)
  5. ^ DS Evans. (June 20–24, 1966): The Revision of the General Catalog of Radial Velocities . In Alan Henry Batten, John Frederick Heard: Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no.30. University of Toronto: International Astronomical Union. bibcode : 1967IAUS ... 30 ... 57E .
  6. ↑ a b c Alpha Antliae , Stars , Jim Kaler.
  7. ↑ HD 90610 , database entry , Catalog of Apparent Diameters and Absolute Radii of Stars (CADARS), 3rd edition, LE Pasinetti-Fracassini, L. Pastori, S. Covino and A. Pozzi, CDS ID II / 224 .
  8. ^ Andrew McWilliam: High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances . In: Astrophysical Journal Supplement Series . 74, December 1990, pp. 1075-1128. bibcode : 1990ApJS ... 74.1075M . doi : 10.1086 / 191527 .
  9. ↑ Christopher Watson: α Antliae . AAVSO website , American Association of Variable Star Observers.