J/A+AS/31/439 A Survey of HII Regions in M31 (Pellet+ 1978)
A Survey of HII Regions in M31
Pellet A., Astier N., Viale A., Courtes G., Maucherat, A., Monnet, G.,
Simien, F.
<Astron. Astrophys. Suppl. Ser. 31, 439 (1978)>
=1978A&AS...31..439P 1978A&AS...31..439P
ADC_Keywords: Galaxies, optical ; H II regions ; Surveys
Keywords: Galaxies, individual: M31 ; H II regions
Description:
An H-alpha survey, using a focal reducer and narrow-band interference
filters, has resulted in the detection of nearly a thousand HII
regions in M31. The catalog gives their positions, dimensions, and
surface brightnesses. The surface brightnesses are on an absolute
scale; the photographic measures were calibrated by using
photoelectric measures from two different sources. The detection limit
reached corresponds to an emission measure of 40cm-6pc at a
temperature of 10000K.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 88 981 HII regions in M31
table3.dat 35 13 Physical data of the HII regions in M31
table4.dat 35 18 Physical data of the HII regions in M33
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Objects:
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RA (2000) DE Designation(s)
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00 42 44.3 +41 16 09 M31 = NGC 224
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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 --- HII [1,981] Number of region in this catalogue
8- 9 I2 --- Int [,3] Intensity class of HII region
12- 18 F7.2 arcmin Xpos [-71.2,74.3] X-coordinate of HII region (1)
22- 27 F6.2 arcmin Ypos [-23.5,18.4] Y-coordinate of HII region (1)
32- 36 F5.2 arcmin A ? Largest dimension of HII region
42- 45 F4.2 arcmin B ? Perpendicular dimension of HII region
49- 87 A39 --- BAN [0-9, ] Baade & Arp numbers (1964ApJ...139.1027B 1964ApJ...139.1027B)
BA 1-NNN in Simbad
88 A1 --- f_BAN [*] An * indicates coordinates differ from
Baade & Arp (1964ApJ...139.1027B 1964ApJ...139.1027B)
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Note (1): Galactic coordinates on the plane of the sky, with
X axis directed along the major axis, positive towards the North, and
Y axis directed along the minor axis, positive towards the South.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- HII HII region number in M31
8- 16 A9 --- n_HII Note on HII region
18- 20 I3 pc Diam Diameter of HII region
22- 26 F5.2 10-8W/m2/sr S(Halpha) Surface brightness on Hα plates
28- 31 I4 pc/cm6 EM Emission measure
33- 35 I3 pc/cm2 U Excitation parameter
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- HII HII region name in M33
8- 16 A9 --- n_HII Note on HII region
18- 20 I3 pc Diam Diameter of HII region
22- 26 F5.2 10-8W/m2/sr S(Halpha) Surface brightness on Hα plates
28- 31 I4 pc/cm6 EM Emission measure
33- 35 I3 pc/cm2 U Excitation parameter
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Acknowledgements: Monica Neininger (RAI Univ. Bonn)
History:
* 24-Jan-2001: Prepared by Nikolaus Neininger
* 13-Sep-2003: Missing numbers 961-981 in table1 added at CDS
Tables 3 and 4 added.
(End) Nikolaus Neininger [RAIUB] 24-Jan-2001