J/ApJ/562/368 UV photometry in NGC 2808 (Brown+, 2001)
Flash mixing on the white dwarf cooling curve: understanding hot horizontal
branch anomalies in NGC 2808.
Brown T.M., Sweigart A.V., Lanz T., Landsman W.B., Hubeny I.
<Astrophys. J. 562, 368 (2001)>
=2001ApJ...562..368B 2001ApJ...562..368B
ADC_Keywords: Clusters, globular ; Photometry, ultraviolet
Keywords: globular clusters: individual (NGC 2808) - stars: atmospheres -
stars: evolution - stars: horizontal-branch - ultraviolet: stars
Description:
We examine new observations of NGC 2808, taken with the far-UV and
near-UV cameras on the Space Telescope Imaging Spectrograph (STIS) on
board the Hubble Space Telescope (HST).
Images were obtained in the far-UV crystal quartz (FUV/F25QTZ; pivot
wavelength 1600Å), near-UV 2700Å continuum (NUV/F25CN270), and
clear CCD (CCD/50CCD; pivot wavelength 5850Å) modes, employing a
cross-shaped dither pattern.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 48 295 Photometric catalog
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See also:
J/A+AS/84/59 : BV photometry of NGC 2808 (Ferraro+, 1990)
Table 1: UV Imaging
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STIS Band Exposure Observation Dates (2000) Coverage
(s) (arcmin2)
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FUV/F25QTZ 8916 Jan 18, Feb 16 1744
NUV/F25CN270 8906 Jan 19, Feb 20 1752
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1 I1 h RAh Right Ascension (J2000) (1)
3- 4 I2 min RAm Right Ascension (J2000) (1)
6- 12 F7.4 s RAs Right Ascension (J2000) (1)
14 A1 --- DE- Declination (J2000) (1)
15- 16 I2 deg DEd Declination (J2000) (1)
18- 19 I2 arcmin DEm Declination (J2000) (1)
21- 26 F6.3 arcsec DEs Declination (J2000) (1)
28- 32 F5.2 mag FUVmag The Far-UV STMAG magnitude (1600Å)
34- 37 F4.2 mag e_FUVmag The error in FUVmag
39- 43 F5.2 mag NUVmag The Near-UV STMAG magnitude (2700Å)
45- 48 F4.2 mag e_NUVmag The error in NUVmag
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Note (1): The relative astrometry is very accurate (tenths of a 0.025arcsec
STIS pixel), but the absolute astrometry is subject to a 1-2 arcsec
uncertainty (associated with the position of the guide stars). Objects
identified as [BSL2001] JHHMMSS.ssss+DDMMSS.sss in Simbad
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 29-Jan-2002