J/AJ/143/149 NIR spectroscopy of Galactic Wolf-Rayet stars. II. (Shara+, 2012) ================================================================================ A near-infrared survey of the inner Galactic plane for Wolf-Rayet stars. II. Going fainter: 71 more new W-R stars. Shara M.M., Faherty J.K., Zurek D., Moffat A.F.J., Gerke J., Doyon R., Artigau E., Drissen L. =2012AJ....143..149S ================================================================================ ADC_Keywords: Stars, Wolf-Rayet ; Photometry, infrared ; Photometry, UBVRI ; Spectra, infrared ; Equivalent widths ; Spectral types Keywords: Galaxy: disk - Galaxy: stellar content - infrared: stars - stars: emission-line, Be - stars: Wolf-Rayet - surveys Abstract: We are continuing a J, K and narrowband imaging survey of 300{deg}^2^ of the plane of the Galaxy, searching for new Wolf-Rayet (W-R) stars. Our survey spans 150{deg} in Galactic longitude and reaches 1{deg} above and below the Galactic plane. The survey has a useful limiting magnitude of K=15 over most of the observed Galactic plane, and K=14 (due to severe crowding) within a few degrees of the Galactic center. Thousands of emission-line candidates have been detected. In spectrographic follow-ups of 146 relatively bright W-R star candidates, we have re-examined 11 previously known WC and WN stars and discovered 71 new W-R stars, 17 of type WN and 54 of type WC. Our latest image analysis pipeline now picks out W-R stars with a 57% success rate. Star subtype assignments have been confirmed with the K-band spectra and distances approximated using the method of spectroscopic parallax. Some of the new W-R stars are among the most distant known in our Galaxy. The distribution of these new W-R stars is beginning to trace the locations of massive stars along the distant spiral arms of the Milky Way. Description: Near-IR spectra of candidate Wolf-Rayet stars were obtained with the SpeX spectrograph mounted on the 3m NASA Infrared Telescope Facility (IRTF) over 11 half-nights in 2009 August. We obtained an average resolving power of {lambda}/{Delta}{lambda}~1200. The near-infrared spectral data spanned 0.8-2.4{mu}m. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table1.dat 86 12 *Previously identified Wolf-Rayet stars table2.dat 86 71 New Wolf-Rayet stars table3.dat 81 12 Known Wolf-Rayet stars table4.dat 81 71 New Wolf-Rayet stars table5.dat 56 17 Equivalent width ({AA}) measurement for the most prominent lines of the new WN stars table6.dat 60 54 Equivalent width ({AA}) measurement for the most prominent lines of the new WC stars table7.dat 58 54 New WC stars organized by subtype table8.dat 58 17 New WN stars organized by subtype -------------------------------------------------------------------------------- Note on table1.dat: previously identified Wolf-Rayet stars from Shara et al. (Paper I, 2009AJ....138..402S ) that were observed using the SpeX spectrograph. A lack of BVR data implies that the star is below the 21st magnitude plate limits of the digitized sky surveys. -------------------------------------------------------------------------------- See also: VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006) I/297 : NOMAD Catalog (Zacharias+ 2005) III/215 : 7th Catalog of Galactic Wolf-Rayet stars (van der Hucht, 2001) III/143 : Spectrophotometry of Wolf-Rayet Stars (Torres-Dodgen+ 1988) J/ApJ/733/123 : The Wolf-Rayet content of M33 (NGC 598) (Neugent+, 2011) J/A+A/518/A29 : WR stars distribution in 2 nearby galaxies (Leloudas+, 2010) J/A+AS/108/669 : IUE spectra of WR stars (Niedzielski+, 1994) Byte-by-byte Description of file: table[12].dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 10 A10 --- Name Wolf-Rayet star name 12- 13 I2 h RAh Hour of Right Ascension (J2000) 15- 16 I2 min RAm Minute of Right Ascension (J2000) 18- 22 F5.2 s RAs Second of Right Ascension (J2000) 24 A1 --- DE- Sign of the Declination 25- 26 I2 deg DEd Degree of Declination (J2000) 28- 29 I2 arcmin DEm Arcminute of Declination (J2000) 31- 35 F5.2 arcsec DEs Arcsecond of Declination (J2000) 37- 42 F6.2 deg GLON Galactic longitude l 44- 48 F5.2 deg GLAT Galactic latitude b 50- 54 F5.2 mag Bmag [15.23/20.75]? NOMAD B band magnitude (from Cat. I/297) 56- 60 F5.2 mag Vmag [14.49/17.74]? NOMAD V band magnitude (from Cat I/297) 62- 66 F5.2 mag Rmag [13.31/20.02]? NOMAD R band magnitude (from Cat. I/297) 68- 73 F6.3 mag Jmag [8.61/18.08] 2MASS J magnitude 75- 80 F6.3 mag Hmag [7.99/15.06] 2MASS H magnitude 82- 86 F5.2 mag Ksmag [7.8/14.37] 2MASS Ks magnitude -------------------------------------------------------------------------------- Byte-by-byte Description of file: table[34].dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 10 A10 --- Name Wolf-Rayet star name 12- 13 A2 --- u_SpT [ :] Uncertainty flag on SpT (G1) 14- 35 A22 --- SpT Wolf-Rayet spectral subtype 37- 40 F4.2 mag AKs.J ? Interstellar K_s_-band extinction estimated using the 2MASS J-K_s_ color and subtype values provided in Crowther et al. (2006MNRAS.372.1407C) 42- 45 F4.2 mag AKs.H ? Interstellar K_s_-band extinction estimated using the 2MASS H-K_s_ color and subtype values provided in Crowther et al. (2006MNRAS.372.1407C) 47- 51 F5.2 mag AKs ? The average of the two values AKs.J and AKs.H 53- 57 F5.2 mag Ksmag 2MASS apparent K_s_ magnitude 59- 63 F5.2 mag KsMag ? The subtype-specific absolute magnitude derived for spectral subtypes by Crowther et al. (2006MNRAS.372.1407C) 65- 69 F5.2 mag DM ? Distance modulus 71- 75 F5.2 kpc d ? Heliocentric distance (with typical uncertainties of 25%) 77- 81 F5.2 kpc RG ? Galactocentric distance R_G_ (with typical uncertainties of 25%) -------------------------------------------------------------------------------- Byte-by-byte Description of file: table5.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 10 A10 --- Name Wolf-Rayet star name <[SFZ2012] FFFF-NNNAA> in Simbad 12 A1 --- f_SpT [:] Uncertainty flag on SpT (G1) 13- 34 A22 --- SpT Wolf-Rayet spectral subtype 36- 37 I2 0.1nm W(2.100) ? Equivalent width of NV 2.100{mu}m emission line 39- 42 I4 0.1nm W(2.115) Equivalent width of HeI 2.115{mu}m emission line 44- 46 I3 0.1nm W(2.165) Equivalent width of HeII+Br{gamma} 2.165{mu}m emission line 48- 51 I4 0.1nm W(2.189) ? Equivalent width of HeII 2.189{mu}m emission line 53- 56 F4.1 --- Ratio ? ratio of equivalent widths W(2.189/2.165) used to categorize the WN stars -------------------------------------------------------------------------------- Byte-by-byte Description of file: table6.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 10 A10 --- Name Wolf-Rayet star name <[SFZ2012] FFFF-NNNAA> in Simbad 12 A1 --- f_SpT [:] Uncertainty flag on SpT (G1) 13- 34 A22 --- SpT Wolf-Rayet spectral subtype 36- 39 I4 0.1nm W(2.076) ? Equivalent width of CIV 2.076{mu}m emission line 40 A1 --- f_W(2.076) [a] Flag on W(2.076) (1) 42- 45 I4 0.1nm W(2.110) ? Equivalent width of HeI+CIII 2.110{mu}m emission line 46 A1 --- f_W(2.110) [b] Flag on W(2.110) (1) 48- 50 I3 0.1nm W(2.165) ? Equivalent width of HeI 2.165{mu}m emission line 51 A1 --- f_W(2.165) [c] Flag on W(2.165) (1) 53- 55 I3 0.1nm W(2.189) ? Equivalent width of HeII 2.189{mu}m emission line 56 A1 --- f_W(2.189) [d] Flag on W(2.189) (1) 58- 60 F3.1 --- Ratio ? ratio of equivalent widths W(2.076/2.110) used to categorize the WC stars -------------------------------------------------------------------------------- Note (1): The Table 6 provides a second value for the equivalent widths of the Wolf-Rayet star 1669-24L. This second equivalent width is: a = W(2.076)=-423{AA}; b = W(2.110)=-47{AA}; c = W(2.165)=-25{AA}; d = W(2.189)=-56{AA}. -------------------------------------------------------------------------------- Byte-by-byte Description of file: table[78].dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 10 A10 --- Name Wolf-Rayet star name <[SFZ2012] FFFF-NNNAA> in Simbad 12 A1 --- f_SpT [:] Uncertainty flag on SpT (G1) 13- 34 A22 --- SpT Wolf-Rayet spectral subtype 36- 40 F5.2 mag Dm(HeI) ? Difference from the interpolated continum magnitude for the HeI narrowband filter (2) 42- 46 F5.2 mag Dm(CIV) ? Difference from the interpolated continum magnitude for the CIV narrowband filter (2) 48- 52 F5.2 mag Dm(Brg) ? Difference from the interpolated continum magnitude for the Br{gamma} narrowband filter (2) 54- 58 F5.2 mag Dm(HeII) ? Difference from the interpolated continum magnitude for the HeII narrowband filter (2) -------------------------------------------------------------------------------- Note (2): Negative value indicate emission, positive values indicate absorption for lines in the narrowband emission-line filter. -------------------------------------------------------------------------------- Global notes: Note (G1): : = indicates an uncertainty of up to +/-2 subtypes (differences among stars of type WC4-8 are difficult to distinguish from one another). History: From electronic version of the journal References: Shara et al. Paper I. 2009AJ....138..402S ================================================================================ (End) Sylvain Guehenneux [CDS] 22-Jul-2013