BD+48 740

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BD+48 740
Observation data
Epoch J2000      Equinox J2000
Constellation Perseus
Right ascension 02h 42m 58.21780s[1]
Declination +48° 55′ 48.2155″
Characteristics
Spectral type K2
B−V color index +1.35
Variable type constant
Astrometry
Radial velocity (Rv) -5.60 km/s
Proper motion (μ) RA: -5.94 mas/yr
Dec.: -2.02 mas/yr
Parallax (π) 1.36[1] mas
Other designations
BD+48 740, AG+48 308, GSC 03304-00090, HIC 12684, HIP 12684, 2MASS J02425822+4855483, PPM 45405, SAO 38272, TYC 3304-90-1
Database references
SIMBAD data

BD+48 740 is a giant star suspected of having recently engulfed one of its planets. The star has an overabundance of lithium in its atmosphere, a metal that is destroyed by nuclear reactions in stars. Detection of radial velocity variations indicate a companion planet of 1.6 jupiter masses in a highly eccentric orbit, making orbits of other planets unstable. These indications make the discoverers conclude that another planet has recently plunged into the star, been destroyed, and contributed its lithium content to the star.[2]

References[edit]

  1. ^ a b "BD+48 740". SIMBAD Astronomical Database. Retrieved 2012-08-22. 
  2. ^ BD+48 740 - Li overabundant giant star with a planet. A case of recent engulfment? Bibcode2012ApJ...754L..15A

External links[edit]