Hostname: page-component-cd9895bd7-gvvz8 Total loading time: 0 Render date: 2024-12-27T11:16:46.752Z Has data issue: false hasContentIssue false
  • English
  • Français

Line bisector analysis of stars with companions in the SARG survey at the TNG

Published online by Cambridge University Press:  19 April 2010

K. Goździewski ,
A. Niedzielski ,
J. Schneider ,
A. F. Martínez Fiorenzano ,
R. G. Gratton ,
S. Desidera ,
R. Cosentino ,
M. Cecconi  and
M. Endl
A. F. Martínez Fiorenzano
Affiliation:
Fundación Galileo Galilei – INAF, Rbla. José Ana Fdez. Pérez 7, 38712 Breña Baja (TF), Spain
R. G. Gratton
Affiliation:
INAF – Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, 35122 Padova, Italy
S. Desidera
Affiliation:
INAF – Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, 35122 Padova, Italy
R. Cosentino
Affiliation:
Fundación Galileo Galilei – INAF, Rbla. José Ana Fdez. Pérez 7, 38712 Breña Baja (TF), Spain Osservatorio Astrofisico di Catania, via S. Sofia 78, 95123, Italy
M. Cecconi
Affiliation:
Fundación Galileo Galilei – INAF, Rbla. José Ana Fdez. Pérez 7, 38712 Breña Baja (TF), Spain
M. Endl
Affiliation:
McDonald Observatory, The University of Texas at Austin, Austin, TX 78712, USA
Get access

Abstract

We present an analysis of how bisectors of spectral lines vary, for a few stars observed during the high-accuracy 
radial-velocity planet survey ongoing at the Telescopio Nazionale Galileo (TNG) using the Galileo High Resolution Spectrograph (Spettrografo Alta Risoluzione Galileo, SARG), and discuss their relation with differential radial velocities. The iodine cell lines employed in the radial velocity measurements were used to improve the wavelength calibration and then removed before bisector analysis. The line bisectors were then computed from average absorption profiles obtained by cross-correlation of the stellar spectra with a mask made from suitable lines of a solar catalog. Bisector velocity spans were determined and the run of bisector velocity span against radial velocity was studied to search for correlations between line asymmetries and radial velocity variations. We present an analysis of spectra of HD 216122B that show a slight contamination likely to be due to a stellar companion, and an analysis of spectra of HD 76036A, a case where the line bisectors are useful for improving the RV measurements. These systems are part of a survey sample being observed with adaptive optics (AdOpt at the TNG since 2006) in an attempt to visually resolve stellar companions.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 42: Extrasolar Planets in Multi-Body Systems: Theory and Observations , 2010 , pp. 137 - 141
Copyright
© EAS, EDP Sciences, 2010

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Desidera, S., et al., 2003, A&A, 405, 207
Endl, M., et al., 2000, A&A, 362, 585
Gray, D.F., 1983, Pub. A.S.P., 95, 252 CrossRef
Martínez Fiorenzano, A.F., et al., 2005, A&A, 442, 775
Martínez Fiorenzano, A.F., 2005, PhD. Thesis [astro-ph/0603788]
Moore, C.E., et al., 1966, The solar spectrum 2935 Å to 8770 Å (National Bureau of Standards Monograph, Washington: US Government Printing Office (USGPO))