J/A+A/485/41 VLT spectroscopy of blue massive stars in NGC55 (Castro+, 2008)
The Araucaria Project: VLT-spectroscopy of blue massive stars in NGC55.
Castro N., Herrero A., Garcia M., Trundle C., Bresolin F., Gieren W.,
Pietrzynski G., Kudritzki R.-P., Demarco R.
<Astron. Astrophys., 485, 41-50 (2008)>
=2008A&A...485...41C 2008A&A...485...41C
ADC_Keywords: Galaxies, nearby ; Stars, blue ; Spectral types ; Photometry ;
Radial velocities
Keywords: galaxies: individual: NGC 55 - galaxies: stellar content -
stars: early-type - stars: fundamental parameters - catalogs
Abstract:
This is the first paper of a series devoted to studying the population
of blue massive stars in NGC 55, a galaxy of the Sculptor group at a
distance of about 2Mpc.
We have obtained optical (3300-6210Å), low-resolution spectra of
approximately 200 blue massive stars with VLT-FORS2, which we have
classified with the aid of Milky Way and Magellanic Cloud standard
stars.
Description:
Targets were selected from existing V- and I-band photometry obtained
as part of the ongoing ARAUCARIA Cepheid search project whose
results have been reported in Pietrzynski et al. (2006, Cat.
J/AJ/132/2556). These data were taken with the Warsaw 1.3m
telescope at Las Campanas Observatory.
We obtained spectra for ∼200 objects with FORS2 (FOcal Reducer and low
dispersion Spectrograph) at the Very Large Telescope (VLT-UT2), in the
Mask eXchange Unit (MXU) mode. The observations, performed in November
2004.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
tablea1.dat 94 168 Blue massive stars observed in NGC 55. We have also
included spectra displaying only HII emissions
tablea2.dat 82 23 F- and G-type stars observed in NGC 55
tablea3.dat 82 13 Low luminosity class stars, likely members of the
Milky Way halo
--------------------------------------------------------------------------------
See also:
J/MNRAS/370/25 : XMM observations of NGC 55 (Stobbart+, 2006)
J/AJ/132/2556 : ARAUCARIA project: Cepheids in NGC 55 (Pietrzynski+, 2006)
J/ApJ/672/266 : ARAUCARIA project: NGC 55 Cepheids JK mag (Gieren+, 2008)
Byte-by-byte Description of file: tablea[123].dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 A5 --- [CHG2008] Star identification, AA-NN (1)
7 I1 h RAh Right ascension (J2000)
9- 10 I2 min RAm Right ascension (J2000)
12- 16 F5.2 s RAs Right ascension (J2000)
18 A1 --- DE- Declination sign (J2000)
19- 20 I2 deg DEd Declination (J2000)
22- 23 I2 arcmin DEm Declination (J2000)
25- 29 F5.2 arcsec DEs Declination (J2000)
31- 36 F6.3 mag Vmag V magnitude
38- 43 F6.3 mag V-I V-I colour index
45- 52 A8 --- SpType MK Spectral type
55- 61 F7.2 arcsec Rg Projected galactocentric distance
63- 65 I3 km/s RV Radial velocity
67- 69 I3 --- S/N Signal-to-noise ratio of the spectrum
71- 77 A7 --- Met ?=- Metallicity estimate (Milky Way- or
Magellanic Cloud-similarity)
79- 94 A16 --- Com Comments
--------------------------------------------------------------------------------
Note (1): Star identification, consisting on field number (A, B, C1, C2, D)
followed by slit number.
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 23-Jun-2008