Identification of new Classical Ae stars in the Galaxy using LAMOST DR5

Abstract

We report the first systematic study to identify and characterize a sample of classical Ae stars in the Galaxy. The spectra of these stars were retrieved from the A-star catalog using the Large sky Area Multi-Object fiber Spectroscopic Telescope (LAMOST) survey. We identified the emission-line stars in this catalog from which 159 are confirmed as classical Ae stars. This increases the sample of known classical Ae stars by about nine times from the previously identified 21 stars. The evolutionary phase of classical Ae stars in this study is confirmed from the relatively small mid- and far-infrared excess and from their location in the optical color-magnitude diagram. We estimated the spectral type using MILES spectral templates and identified Classical Ae stars beyond A3, for the first time. The prominent emission lines in the spectra within the wavelength range 3700 -- 9000 Å are identified and compared with the features present in classical Be stars. The Hα emission strength of the stars in our sample show a steady decrease from late-B type to Ae stars, suggesting that the disc size may be dependent on the spectral type. Interestingly, we noticed emission lines of Fe{\sc ii}, O{\sc i} and Paschen series in the spectrum of some classical Ae stars. These lines are supposed to fade out by late B-type and should not be present in Ae stars. Further studies, including spectra with better resolution, is needed to correlate these results with the rotation rates of classical Ae stars.

arXiv comment11 pages, 8 figures, accepted for publication in MNRAS

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• Spectroscopic study of Herbig Ae/Be stars in the Galactic Anti-center region from LAMOST DR5
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• Estimation of Stellar Parameters and Mass Accretion Rate of Classical T Tauri Stars from LAMOST DR6
• Searching for shell stars in LAMOST DR4 by probing the Fe 42 multiplet lines
• Study of the transient nature of classical Be stars using multi-epoch optical spectroscopy
• Study of Classical Be stars in open clusters older than 100 Myr
• A Catalog of 45,206 Hα Emission-line Stars from LAMOST MRS DR7