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J/AJ/139/2620       Spectroscopy of M81 globular clusters    (Nantais+, 2010)

Spectroscopy of M81 globular clusters. Nantais J.B., Huchra J.P. <Astron. J., 139, 2620-2638 (2010)> =2010AJ....139.2620N
ADC_Keywords: Galaxies, nearby ; Spectroscopy ; Radial velocities Keywords: galaxies: individual (M81) - galaxies: spiral - galaxies: star clusters: general Abstract: We obtained spectra of 74 globular clusters (GCs) in M81. These GCs had been identified as candidates in a Hubble Space Telescope (HST) Advanced Camera for Surveys I-band survey. Sixty-eight of these 74 clusters lie within 7' of the M81 nucleus. Sixty-two of these clusters are newly spectroscopically confirmed, more than doubling the number of confirmed M81 GCs from 46 to 108. We determined metallicities for our 74 observed clusters using an empirical calibration based on Milky Way GCs. Description: We obtained spectra of a total of 207 extended objects in M81 on the nights of 2006 May 3-5 and 2007 November 13 and 17 with Hectospec on the 6.5m MMT on Mt. Hopkins in Arizona. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 73 108 Globular cluster positions and velocities table3.dat 60 77 Non-globular cluster objects table4.dat 172 74 Brodie & Huchra indices table5.dat 186 74 Pseudo-Lick indices table6.dat 20 108 Metallicities of globular clusters
See also: J/AJ/109/1055 : Globulars of M81 (Perelmuter+ 1995) J/AJ/122/1330 : HST BVI photometry of M 81 star clusters (Chandar+, 2001) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 9 A9 --- ID Object designation 11- 22 A12 --- OName Literature spectroscopy IDs (1) 24- 28 I5 --- PR95 ? Perelmuter & Racine, 1995, Cat. J/AJ/109/1055 number, [PR95] NNNNN 30- 32 I3 --- CFT01 ? Chandar et al. 2001, Cat. J/AJ/122/1330 number, [CFT2001] NNN 34- 35 I2 h RAh Right ascension (J2000) 37- 38 I2 min RAm Right ascension (J2000) 40- 45 F6.3 s RAs Right ascension (J2000) 47 A1 --- DE- Declination sign (J2000) 48- 49 I2 deg DEd Declination (J2000) 51- 52 I2 arcmin DEm Declination (J2000) 54- 58 F5.2 arcsec DEs Declination (J2000) 59 A1 --- --- [0] 61- 65 F5.2 arcmin Dist Distance from M81 center 67- 70 I4 km/s RV Radial velocity 72- 73 I2 km/s e_RV rms uncertainty on RV
Note (1): Literature spectroscopy IDs in parentheses represent objects for which low signal-to-noise spectra were obtained by PBH, but the objects were not confirmed as clusters. PR/PBH object 50388 was originally labeled as a star, but we find it to be a GC. Object 1859, a GC overlapping with an HII region, was cleaned of emission lines before its velocity was determined, so as to find the velocity of the GC rather than the HII region.
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 4 I4 --- ID ? Object designation 6- 8 A3 --- Type Object type: gx=galaxy, hii=HII region, oc=open cluster. 10- 14 I5 --- PR95 ? Perelmuter & Racine, 1995, Cat. J/AJ/109/1055 number, [PR95] NNNNN 16- 18 I3 --- CFT01 ? Chandar et al. 2001, Cat. J/AJ/122/1330 number, [CFT2001] NNN 20- 21 I2 h RAh Right ascension (J2000) 23- 24 I2 min RAm Right ascension (J2000) 26- 30 F5.2 s RAs Right ascension (J2000) 32 A1 --- DE- Declination sign (J2000) 33- 34 I2 deg DEd Declination (J2000) 36- 37 I2 arcmin DEm Declination (J2000) 39- 43 F5.2 arcsec DEs Declination (J2000) 45- 49 F5.2 arcmin Dist Distance 51- 56 I6 km/s RV Radial velocity 58- 60 I3 km/s e_RV rms uncertainty on RV
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 4 I4 --- ID Object designation 6- 11 F6.3 mag CNR/CN1 CNR/CN1 index 13- 18 F6.3 mag G4300 G4300 index 20- 25 F6.3 mag Hbeta Hbeta index 27- 32 F6.3 mag MgH/Mg1 MgH/Mg1 index 34- 39 F6.3 mag Mg2 Mg2 index 41- 46 F6.3 mag Mgb Mgb index 48- 53 F6.3 mag Fe5270 Fe5270 index 55- 60 F6.3 mag NaD/Na1 NaD/Na1 index 62- 67 F6.3 mag CNB ? CNB index 69- 74 F6.3 mag H+K ? H&K index 76- 81 F6.3 mag MgG MgG index 83- 88 F6.3 mag delta ? δ index 90- 95 F6.3 mag e_CNR/CN1 rms uncertainty on CNR/CN1 97-102 F6.3 mag e_G4300 rms uncertainty on G4300 104-109 F6.3 mag e_Hbeta rms uncertainty on Hbeta 111-116 F6.3 mag e_MgH/Mg1 rms uncertainty on MgH/Mg1 118-123 F6.3 mag e_Mg2 rms uncertainty on Mg2 125-130 F6.3 mag e_Mgb rms uncertainty on Mgb 132-137 F6.3 mag e_Fe5270 rms uncertainty on Fe5270 139-144 F6.3 mag e_NaD/Na1 rms uncertainty on NaD/Na1 146-151 F6.3 mag e_CNB rms uncertainty on CNB 153-158 F6.3 mag e_H+K rms uncertainty on H&K 160-165 F6.3 mag e_MgG rms uncertainty on MgG 167-172 F6.3 mag e_delta rms uncertainty on delta
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 4 I4 --- ID Object designation 6- 11 F6.3 mag CN2 CN2 index 13- 18 F6.3 mag Ca42 Ca42 index 20- 25 F6.3 mag Fe43 Fe43 index 27- 32 F6.3 mag Ca44 Ca44 index 34- 39 F6.3 mag Fe45 Fe45 index 41- 46 F6.3 mag C246 C_246 index 48- 53 F6.3 mag Fe50 Fe50 index 55- 60 F6.3 mag Fe53 Fe53 index 62- 67 F6.3 mag Fe54 Fe54 index 69- 74 F6.3 mag Fe5709 Fe5709 index 76- 81 F6.3 mag Fe5782 Fe5782 index 83- 88 F6.3 mag TiO1 TiO1 index 90- 95 F6.3 mag TiO2 TiO2 index 97-102 F6.3 mag e_CN2 rms uncertainty on CN2 104-109 F6.3 mag e_Ca42 rms uncertainty on Ca42 111-116 F6.3 mag e_Fe43 rms uncertainty on Fe43 118-123 F6.3 mag e_Ca44 rms uncertainty on Ca44 125-130 F6.3 mag e_Fe45 rms uncertainty on Fe45 132-137 F6.3 mag e_C246 rms uncertainty on C246 139-144 F6.3 mag e_Fe50 rms uncertainty on Fe50 146-151 F6.3 mag e_Fe53 rms uncertainty on Fe53 153-158 F6.3 mag e_Fe54 rms uncertainty on Fe54 160-165 F6.3 mag e_Fe5709 rms uncertainty on Fe5709 167-172 F6.3 mag e_Fe5782 rms uncertainty on Fe5782 174-179 F6.3 mag e_TiO1 rms uncertainty on TiO1 181-186 F6.3 mag e_TiO2 rms uncertainty on TiO2
Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1- 9 A9 --- ID Object designation 11- 15 F5.2 [-] [Fe/H] ? Metallicity 17- 20 F4.2 [-] e_[Fe/H] ? rms uncertainty on [Fe/H]
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 02-Jun-2012
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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