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J/ApJ/720/679    Optical spectroscopy in Cygnus X region         (Beerer+, 2010)

A Spitzer view of star formation in the Cygnus X North complex. Beerer I.M., Koenig X.P., Hora J.L., Gutermuth R.A., Bontemps S., Megeath S.T., Schneider N., Motte F., Carey S., Simon R., Keto E., Smith H.A., Allen L.E., Fazio G.G., Kraemer K.E., Price S., Mizuno D., Adams J.D., Hernandez J., Lucas P.W. <Astrophys. J., 720, 679-693 (2010)> =2010ApJ...720..679B
ADC_Keywords: Spectral types ; YSOs ; Photometry, SDSS ; Infrared sources Keywords: infrared: stars - H II regions - stars: early-type - stars: formation - stars: pre-main sequence Abstract: We present new images and photometry of the massive star-forming complex Cygnus X obtained with the Infrared Array Camera (IRAC) and the Multiband Imaging Photometer for Spitzer (MIPS) on board the Spitzer Space Telescope. A combination of IRAC, MIPS, UKIRT Deep Infrared Sky Survey, and Two Micron All Sky Survey data are used to identify and classify young stellar objects (YSOs). Of the 8231 sources detected exhibiting infrared excess in Cygnus X North, 670 are classified as class I and 7249 are classified as class II. Using spectra from the FAST Spectrograph at the Fred L. Whipple Observatory and Hectospec on the MMT, we spectrally typed 536 sources in the Cygnus X complex to identify the massive stars. We find that YSOs tend to be grouped in the neighborhoods of massive B stars (spectral types B0 to B9). Description: Cygnus X was observed with the Spitzer IRAC instrument in all four bands (3.6, 4.5, 5.8, and 8.0um) in three campaigns between 2007 November and 2008 November.The MIPS observations were taken at the fast scan rate, with a typical resolution of 6" in the 24um band. We obtained 536 optical spectra during fall 2008 using the FAST instrument, an optical spectrograph in operation at the focus of the 1.5m Tillinghast reflector at the Fred L. Whipple Observatory and the Hectospec multifiber spectrograph mounted on the 6.5m MMT telescope, both on Mount Hopkins. The FAST spectra were obtained using the 300 groove/mm grating centered at 5500Å with a resolution of 3Å. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table7.dat 60 536 Optical spectroscopy classifications
See also: II/310 : UKIDSS-DR7 Large Area Survey (Lawrence+ 2012) II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) J/A+A/527/A135 : Gas dynamics in Massive Dense Cores in Cygnus-X (Csengeri+, 2011) J/A+A/476/1243 : Millimeter continuum mapping of Cygnus X (Motte+, 2007) J/A+A/375/539 : JHK photometry of compact HII regions in Cyg X (Comeron+, 2001) J/ApJS/101/117 : UBVRIJHKLMNQ photometry in Taurus-Auriga (Kenyon+ 1995) J/A+A/241/551 : Radio continuum in Cygnus X region (Wendker+ 1991) Byte-by-byte Description of file: table7.dat
Bytes Format Units Label Explanations
1- 19 A19 --- Name Source name ( 21- 26 F6.3 mag r'mag Sloan r' band magnitude (1) 28- 32 F5.3 mag e_r'mag Error in r'mag 34- 39 F6.3 mag i'mag Sloan i' band magnitude (1) 41- 45 F5.3 mag e_i'mag Error in i'mag 47- 50 A4 --- SpT MK spectral type 52- 54 F3.1 --- e_SpT Error in SpT 56- 60 F5.2 mag AV The V band extinction
Note (1): To verify that the sources for which we have optical spectra are indeed members of the Cygnus X complex, we plot the spectroscopic sample on a dereddened color-magnitude diagram. We used the catalog of spectral types and intrinsic colors presented in Kenyon & Hartmann (1995, Cat. J/ApJS/101/117) to determine each star's intrinsic r'-i' color via the Sloan filter conversions presented in Jordi et al. (2006A&A...460..339J). See section 3.1 for further details.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 27-Jun-2012
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