J/A+A/466/157 Bulge Microlensing Events (Soto+, 2007)
Spectroscopic and light curve characterization of Bulge Microlensing Events.
Soto M., Minniti D., Rejkuba M.
<Astron. Astrophys. 466, 157 (2007)>
=2007A&A...466..157S 2007A&A...466..157S
ADC_Keywords: Gravitational lensing ; Spectroscopy ; Radial velocities
Keywords: gravitational lensing - stars: kinematics - Galaxy: structure -
Galaxy: stellar content
Abstract:
Microlensing events have been observed regularly by surveys such as
MACHO, OGLE and MOA. They offer an excellent way to probe the galactic
structure, kinematics and stellar content. We have undertaken a
follow-up study of 16 galactic microlensing events to determine masses
and locations of the sources of these events within the Galaxy.
Spectroscopy allows us to obtain information about the sources of the
events.
Low resolution spectra obtained with the Magellan I and II telescopes
were analyzed to obtain radial velocities, spectral type and
extinction by the method of Kane & Sahu (2003ApJ...582..743K 2003ApJ...582..743K). We also
present results for the lens of the event using the microlensing light
curve when possible. Light curves have been analyzed with the standard
and the parallax models. We have inferred a configuration inside our
galaxy for each event, and therefore a lens mass estimation using a
suitable galaxy model. Lens mass determination in some cases shows
massive lenses that can be considered black hole candidates. This is
the case for the events MACHO-98-BLG-6, and OGLE-00-BUL-43. In our
sample only three events do not have enough parallax signal for a
successful estimation of the lens mass.
Description:
Spectroscopy for 16 sources of bulge Microlensing Events of the
galactic bulge. In addition radial velocity standard stars HR3418 and
HR7429 have been included. Each standard star corresponds to one of
the two observing run.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 61 18 Coordinates, exposure times and S/N for the
microlensing event spectra and 2 reference stars
sp/* . 18 Individual event spectra and standard stars
velocity spectra
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See also:
J/AcA/50/1 : OGLE microlensing events in Galactic Bulge (Udalski+, 2000)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- Name Event designation or standard star name
17- 18 I2 h RAh Right ascension (J2000)
20- 21 I2 min RAm Right ascension (J2000)
23- 26 F4.1 s RAs Right ascension (J2000)
28 A1 --- DE- Declination sign (J2000)
29- 30 I2 deg DEd Declination (J2000)
32- 33 I2 arcmin DEm Declination (J2000)
35- 38 F4.1 arcsec DEs Declination (J2000)
40- 43 I4 s ExpTime ? Exposure time
45- 46 I2 --- S/N ? Signal-to-noise ratio
48- 59 A12 --- FileName Name of the file containing the spectrum
in sp subdirectory
61 I1 --- Run [1/2] Run number
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Acknowledgements:
Mario Soto, soto(at)strw.leidenuniv.nl
(End) Patricia Vannier [CDS] 05-Apr-2007