Investigation of 131 Herbig Ae/Be Candidate Stars

Details Investigation of 131 Herbig Ae/Be Candidate Stars Investigation of 131 Herbig Ae/Be Candidate Stars

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aj....126.2971v&link_type=abstract

The Astronomical Journal, Volume 126, Issue 6, pp. 2971-2987.

Astronomy and Astrophysics

Astronomy

94

Catalogs, Stars: Circumstellar Matter, Ism: Clouds, Stars: Pre-Main-Sequence, Techniques: Spectroscopic

Scientific paper

We present a new catalog of 108 Herbig Ae/Be candidate stars identified in the Pico dos Dias Survey, together with 19 previously known candidates and four objects selected from the IRAS Faint Source Catalog. These 131 stars were observed with low- and/or medium-resolution spectroscopy, and we complement these data with high-resolution spectra of 39 stars. The objects present a great variety of Hα line profiles and were separated according to them. Our study suggests that most of the time a Herbig Ae/Be star will present a double peak Hα line profile. Correlations among different physical parameters, such as spectral type and vsini with Hα line profiles were searched. We found no correlation among Hα line profiles and spectral type or vsini except for stars with P Cygni profiles, where there is a correlation with vsini. We also use preliminary spectral energy distributions to seek for any influence of the circumstellar medium in the Hα line profiles. The presence of [O I] and [S II] forbidden lines is used together with the Hα line profiles and these preliminary spectral energy distributions to discuss the circumstellar environment of the Herbig Ae/Be candidates. The distribution of the detected [O I] and [S II] forbidden lines among different spectral types points to a significantly higher occurrence of these lines among B stars, whereas the distribution among different Hα profile types indicates that forbidden lines are evenly distributed among each Hα line-profile type. Combining the distance estimates of the Herbig candidates with the knowledge of the interstellar medium distribution, we have found that 84 candidates can be associated with some of the more conspicuous SFRs, being in the right direction and at a compatible distance. As a further means of checking the properties of the HAeBe candidates, as well as their present evolutionary status, the derived luminosities and effective temperatures of the stars with possible association to the star-forming regions and/or Hipparcos distances were plotted together with a set of pre-main-sequence evolutionary tracks on an HR diagram. A set of 14 stars were found out of their expected positions in the HR diagram.
Based on observations made at the Obsevatório do Pico dos Dias/LNA (Brazil), ESO (Chile), and the Lick Observatory.

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