Access to Astronomical Catalogues

← Click to display the menu
J/A+A/520/A52       31 Com radial velocities                (Strassmeier+, 2010)

Rotation and magnetic activity of the Hertzsprung-gap giant 31 Comae. Strassmeier K.G., Granzer T., Kopf M., Weber M., Kueker M., Reegen P., Rice J.B., Matthews J.M., Kuschnig R., Rowe J.F., Guenther D.B., Moffat A.F.J., Rucinski S.M., Sasselov D., Weiss W.W. <Astron. Astrophys. 520, A52 (2010)> =2010A&A...520A..52S
ADC_Keywords: Stars, giant ; Radial velocities Keywords: stars: activity - stars: atmospheres - stars: individual: 31 Comae - starspots - stars: late-type - stars: rotation Abstract: The single rapidly-rotating G0 giant 31 Comae has been a puzzle because of the absence of photometric variability despite its strong chromospheric and coronal emissions. As a Hertzsprung-gap giant, it is expected to be at the stage of rearranging its moment of inertia, hence likely also its dynamo action, which could possibly be linked with its missing photospheric activity. Our aim is to detect photospheric activity, obtain the rotation period, and use it for a first Doppler image of the star's surface. Its morphology could be related to the evolutionary status. Description: We carried out high-precision, white-light photometry with the MOST satellite, ground-based Stroemgren photometry with automated telescopes, and high-resolution optical echelle spectroscopy with the new STELLA robotic facility. Objects: ----------------------------------------- RA (2000) DE Designation(s) ----------------------------------------- 12 51 41.9 +27 32 27 31 Com = HR 4883 ----------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 53 186 Radial velocities table3.dat 48 91 KPNO radial velocities
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
2- 11 A10 "DD.MM.YYYY" Observation date 13- 20 A8 "h:m:s" Obs.time Time of observation (hh:mm:ss) 24- 37 F14.6 d HJD Heliocentric Julian date of observation 40- 45 F6.3 km/s RV Radial velocity 49- 53 F5.3 km/s e_RV rms uncertainty on RV
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
2- 11 A10 "YYYY/DD/MM" Date UT Date 13- 24 F12.4 d HJD Heliocentric Julian date 27- 30 F4.1 km/s RV Radial velocity 32- 35 F4.1 km/s e_RV rms uncertainty on RV (1) 38- 48 A11 --- RefStar Reference star (2)
Note (1): From 1994-1995 the error of a single unit-weight velocity was 4.5km/s. In 1996, a CCD with smaller pixels but also smaller wavelength coverage was used and the uncertainties were accordingly larger, ∼7km/s. In 1998, the larger wavelength coverage with a bigger CCD reduced this again to 4.0km/s. Note (2): The cross-correlation reference stars 16 Vir, δ Aur, HR 3145, α Tau, and β Gem were used with an adopted velocity of +35.70, +7.61, +70.90, +54.1 and +3.30km/s, respectively.
Acknowledgements: Klaus G. Strassmeier, kstrassmeier(at)
(End) Patricia Vannier [CDS] 05-Aug-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

© Unistra/CNRS