Bibcode
Chojnowski, Drew; Beaton, R.; Burton, A.; Cunha, K. M.; Eikenberry, S. S.; Frinchaboy, P. M.; Hasselquist, S.; Hearty, F. R.; Holtzman, J. A.; Majewski, S. R.; Meszaros, Sz.; Nidever, D. L.; O'Connell, R. W.; Perez, A.; Schiavon, R. P.; Schultheis, M.; Shetrone, M. D.; Skrutskie, M. F.; Whelan, D. G.; Wilson, J. C.; Wisniewski, J. P.; Zasowski, G.
Bibliographical reference
American Astronomical Society, AAS Meeting #221, #144.08
Advertised on:
1
2013
Citations
0
Refereed citations
0
Description
In just one year of operation, the SDSS-III/APOGEE survey has amassed
the largest collection ever of high-resolution, H-band spectra for
Be-type emission-line stars. Of the 300 fibers used in each APOGEE
observation, 35 are reserved for hot, telluric-absorption standard stars
that are selected from the bluest stars (in J-Ks color) in each field
and which are required to be evenly distributed across the plate to
trace spatially-variable telluric contamination. The 73 Be stars (245
individual spectra) targeted thus far were visually identified among the
6435 telluric standards as those showing any sign of emission in Br11,
the strongest Brackett series line in APOGEE's spectral range. While
26/73 stars were previously tagged as emission-line stars in the
literature, the rest are new finds. The double-peaked hydrogen emission
lines, viewed in unprecedented detail via APOGEE, are presumably formed
in disks or shells surrounding rapidly-rotating, early-type stars. A
wide range of intensities, widths, and profile morphologies are included
in the sample, allowing for a broad characterization of the Be
phenomenon in general. Repeated observations of most of the stars
provide information on temporal line profile variation and the Be star
binary fraction. Here we use the Brackett emission lines to derive
radial velocities and line diagnostics (including FWHM, FWFM, V/R, peak
separation) to help classify the sources.