Access to Astronomical Catalogues

← Click to display the menu
J/A+A/509/A24       Radial velocity curve of γ1 Leo      (Han+, 2010)

Detection of planetary companion around K0 III giant star γ1 Leonis. Han I., Lee B.C., Kim K.M., Mkrtichian D.E., Hatzes A.P., Valyavin G. <Astron. Astrophys. 509, A24 (2010)> =2010A&A...509A..24H
ADC_Keywords: Stars, giant ; Planets ; Radial velocities Keywords: stars: individual: gamma1 Leonis - planetary systems - supergiants Abstract: Our primary goal is to search for planets around intermediate mass stars. We are also interested in studying the nature of radial velocity (RV) variations of K giant stars. We selected about 55 early K giant (K0-K4) stars brighter than fifth magnitude that were observed using BOES, a high resolution spectrograph attached to the 1.8m telescope at BOAO (Bohyunsan Optical Astronomy Observatory). BOES is equipped with I2 absorption cell for high precision RV measurements. We detected a periodic radial velocity variations in the K0 III star gamma1 Leo with a period of P=429-days. An orbital fit of the observed RVs yields a period of P=429-days, a semi-amplitude of K=208m/s, and an eccentricity of e=0.14. To investigate the nature of the RV variations, we analyzed the photometric, Ca II λ 8662 equivalent width, and line-bisector variations of gamma1 Leo. We conclude that the detected RV variations can be best explained by a planetary companion with an estimated mass of msini=8.78M and a semi-major axis of a=1.19AU, assuming a stellar mass of 1.23M. Description: The RV measurements obtained from May 2003 until May 2009 are listed in Table 3. Objects: --------------------------------------------- RA (2000) DE Designation(s) --------------------------------------------- 10 19 58.4 +19 50 29 gamma1 Leo = HR 4057 --------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 32 205 Radial velocity of gamma1 Leo
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 14 F14.6 --- HJD Heliocentric Julian date of the observation 15- 23 F9.4 km/s RV Radial velocity 24- 32 F9.4 km/s e_RV Standard error of RV
Acknowledgements: Inwoo Han,
(End) Inwoo Han [KASI, Korea], Patricia Vannier [CDS] 07-Jan-2010
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

catalogue service

© UDS/CNRS

Contact