EXPORT: Spectral classification and projected rotational velocities of Vega-type and pre-main sequence stars

Abstract

Abstract. In this paper we present the first comprehensive results extracted from the spectroscopic campaigns carried out by the EXPORT (EXoPlanetary Observational Research Team) consortium. During 1998-1999, EXPORT carried out an intensive observational effort in the framework of the origin and evolution of protoplanetary systems in order to obtain clues on the evolutionary path from the early stages of the pre-main sequence to stars with planets already formed. The spectral types of 70 stars, and the projected rotational velocities, v sin i, of 45 stars, mainly Vega-type and pre-main sequence, have been determined from intermediate-and high-resolution spectroscopy, respectively. The first part of the work is of fundamental importance in order to accurately place the stars in the HR diagram and determine the evolutionary sequences; the second part provides information on the kinematics and dynamics of the stars and the evolution of their angular momentum. The advantage of using the same observational configuration and methodology for all the stars is the homogeneity of the set of parameters obtained. Results from previous work are revised, leading in some cases to completely new determinations of spectral types and projected rotational velocities; for some stars no previous studies were available.

Searching for a link between the magnetic nature and other observed properties of Herbig Ae/Be stars and stars with debris disks

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Finding the most variable stars in the Orion Belt with the All Sky Automated Survey

“…Haro & Moreno 1953;Herbig & Bell 1988;Yudin & Evans 1998;Eiroa et al 2001;Mora et al 2001;Hernández et al 2004;Acke & van den Ancker 2006). Its photometric variability was detected very early (Pickering 1904).…”

Evolution of Emission‐Line Activity in Intermediate‐Mass Young Stars

“…Recently, there have been attempts to accurately determine the spectral types of HAeBe stars (e.g., Hernández et al 2004;Mora et al 2001). We have compiled these refined spectral type estimates for the stars in our sample from Hernández et al (2004), Mora et al (2001), and Vieira et al (2003).…”