J/ApJ/691/1387 Spectroscopy of the Galactic bar. I. (Rangwala+, 2009)
Fabry-Perot absorption line spectroscopy of the Galactic bar.
I. Kinematics.
Rangwala N., Williams T.B., Stanek K.Z.
<Astrophys. J., 691, 1387-1399 (2009)>
=2009ApJ...691.1387R 2009ApJ...691.1387R (SIMBAD/NED BibCode)
ADC_Keywords: Equivalent widths ; Radial velocities ; Stars, giant ;
Stars, dwarfs ; Spectroscopy ; Milky Way ; Photometry, VRI
Keywords: Galaxy: bulge - Galaxy: kinematics and dynamics - stars: kinematics -
techniques: radial velocities - techniques: spectroscopic
Abstract:
We use Fabry-Perot absorption line imaging spectroscopy to measure
radial velocities using the CaII line in 3360 stars toward three lines
of sight in the Milky Way's bar: Baade's Window and offset position at
(l,b)~(±5.0,-3.5°). This sample includes 2488 bar red clump
giants, 339 bar M/K-giants, and 318 disk main-sequence stars. We
measure the first four moments of the stellar velocity distribution of
the red clump giants, and find it to be symmetric and flat-topped. We
also measure the line-of-sight average velocity and dispersion of the
red clump giants as a function of distance in the bar.
Description:
Observations were made between 1996 and 1999 using the Rutgers
Fabry-Perot (RFP) system at the f/13.5 Cassegrain focus of the Cerro
Tololo Inter-American Observatory (CTIO) 1.5m telescope. The FOV of
the RFP was circular with a diameter of 4'.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 84 3360 Radial velocities and equivalent widths
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See also:
J/MNRAS/348/1439 : OGLE II Galactic center proper motions (Sumi+, 2004)
J/MNRAS/349/1059 : OGLE variables in Galactic bar (Wray+, 2004)
J/A+A/423/517 : Velocities of Galactic disk late-type stars (Rocha-Pinto+,
2004)
J/A+A/425/489 : Late-type stars in the inner Milky Way (Comeron+, 2004)
J/AJ/110/1699 : F-P observations of globular clusters (Gebhardt+ 1995)
J/AJ/113/1026 : Fabry-Perot Observations of M15 (Gebhardt+ 1997)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- [RWS2009] Object identification
11- 16 I6 --- OGLE ? OGLE identification number (1)
18- 19 I2 h RAh Hour of Right Ascension (J2000)
21- 22 I2 min RAm Minute of Right Ascension (J2000)
24- 28 F5.2 s RAs Second of Right Ascension (J2000)
30 A1 --- DE- Sign of the Declination (J2000)
31- 32 I2 deg DEd Degree of Declination (J2000)
34- 35 I2 arcmin DEm Arcminute of Declination (J2000)
37- 40 F4.1 arcsec DEs Arcsecond of Declination (J2000)
42- 48 F7.2 km/s HRV Heliocentric radial velocity
50- 54 F5.2 km/s e_HRV Error in HRV
56- 59 F4.2 0.1nm EW Equivalent width in Angstroms
61- 64 F4.2 0.1nm e_EW Error in EW
66- 71 F6.3 mag Imag The I band magnitude
73- 77 F5.3 mag V-I ? The (V-I) color index
79- 84 A6 --- Ref Source of photometry (2)
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Note (1): Names are in Simbad. See Sumi et al., 2004,
Cat. J/MNRAS/348/1439. OGLE field number (SC) are:
BWCa = 45
MM5B[acd] = 26
MM7B[ac] = 17
Note (2): References as follows:
o = OGLE (Szymanski, M.K. 2005AcA....55...43S 2005AcA....55...43S; see Cat. J/MNRAS/348/1439;
precision 1%-2%);
s = SAAO (1m telescope at the South African Astronomical Observatory;
precision 5%-10%);
f = Fabry-Perot (FP measurement of the continuum level of the CaII
absorption line to estimate I-band magnitude; precision ≲10%).
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History:
From electronic version of the journal
References:
Rangwala & Williams. Paper II. 2009ApJ...702..414R 2009ApJ...702..414R
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 23-Feb-2011