J/A+A/360/1107 JHK photometry in Sh2-88B HII region (Deharveng+, 2000)
The stellar content of the compact HII region Sh2-88B
Deharveng L., Nadeau D., Zavagno A., Caplan J.
<Astron. Astrophys. 360, 1107 (2000)>
=2000A&A...360.1107D 2000A&A...360.1107D
ADC_Keywords: H II regions ; Photometry, infrared
Keywords: stars: early-type - stars: formation - ISM: HII regions -
ISM: individual objects: Sh2-88B - infrared: stars
Abstract:
We present a photometric study of the compact HII region Sh2-88B and
its associated stellar cluster. The positions and JHKmagnitudes are
obtained for 125 stars over an 80"x80" field centered on the region.
The region has two components , called Sh2-88B1 and Sh2-88B2. B1 is a
compact cometary HII region associated with a cluster containing
several massive stars. The dominant exciting star, at t he center of
the cometary structure, has an ionizing radiation flux corresponding
to a spectral type in the range O8.5V-O9.5V. It is highly reddened,
with a visual extinction in the 30-42mag range, and exhibits a near-IR
excess. B1 has a simple morphology, with the ionized and neutral gas
clearly separated. Its unidentified infrared band (UIB) emission,
observed by ISOCAM in the 5-8.5µm passband, comes from the
photodissociation region at the periphery of the ionized gas. B2 is an
ultracompact HII region whose exciting star, probably of spectral type
later than B0.5V, is not detected; this indicates a visual extinction
greater than 60mag. A very steep and regular increase of the
extinction from west to east is observed over the whole of Sh2-88B.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 65 125 Coordinates and JHK photometry of all the stars
in an 80"x80" field centered on Sh2-88B
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1,125]+ Number of the star
5- 11 F7.4 arcmin oRA Standard (tangential) coordinate of the star (1)
13- 19 F7.4 arcmin oDE Standard (tangential) coordinate of the star (1)
21- 22 I2 h RAh Right ascension (B1950)
24- 25 I2 min RAm Right ascension (B1950)
27- 31 F5.2 s RAs Right ascension (B1950)
33 A1 --- DE- Declination sign (B1950)
34- 35 I2 deg DEd Declination (B1950)
37- 38 I2 arcmin DEm Declination (B1950)
40- 43 F4.1 arcsec DEs Declination (B1950)
45- 50 F6.2 mag Kmag K magnitude, UKIRT system
51 A1 --- n_Kmag [m] m: maximum value for K magnitude
53- 57 F5.2 mag J-K ? J-K color index, UKIRT system
59- 63 F5.2 mag H-K ? H-K color index H-K, UKIRT system
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Note (1): Offset with respect to a field center at
19h 44m 43.5s, +25° 05' 22", B1950.0.
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Acknowledgements: James Caplan
(End) Patricia Bauer [CDS] 26-May-2000