HIIREGION - Sharpless H II Regions

Overview

This database table is derived from data contained in the Sharpless Catalogue of H II regions. The original catalog was published in 1959 in the Astrophysical Journal Supplement Series (number 41, pages 257- 280). The original card deck was in the 026 punch and this was converted to a 029 deck. Many of the quantities in this version of the catalog were not in the published catalog. The epochs of the precessed equatorial coordinates were determined empirically from the data as given on the computer cards.

Catalog Bibcode

1959ApJS....4..257S

References

Sharpless, S. 1959, ApJS, 41, 257

Parameters

Name
The Sharpless H II catalog number. An alternate naming convention exists for these Sharpless HII Regions: S 3 is also referred to as Sh 2-3, and S 53 is also known as Sh 2-53, and so forth.

RA_1950
Right Ascension, 1950 coordinates

Dec_1950
Declination, 1950 coordinates

LII
The galactic longitude of the object.

BII
The galactic latitude of the object.

Diameter
This is the maximum angular diameter of the H II region in minutes of arc. Owing to the diffuse nature of many of the objects, the diameters may have an uncertainty up to an order of 20 percent.

Form
The form of the region. This is classified as follows: 1 = circular, 2 = elliptical, and 3 = irregular.

Structure
The structure of the region. This is classified from 1 = amorphous to 3 = filamentary.

Bright
The brightness of the region. This is classified from 1 = faintest to 3 = brightest.

Stars
Stars is the number of associated stars with the H II region. The individual stars are given in a subsequent table in the published catalog, but are not available in this version of the catalog.

RA_1900
The Right Ascension of the object, in 1900 coordinates.

Dec_1900
The Declination of the object, in 1900 coordinates.

RA
The Right Ascension of the object.

Dec
The Declination of the object.

CRA
Right Ascension, sexagesimal, J2000 coordinates

CDec
Declination, sexagesimal, J2000 coordinates

Lund_Glon
The galactic longitude of the object, based on the Lund pole, in units of degrees.

Lund_Glat
The galactic latitude of the object, based on the Lund pole, in units of degrees.

IAU_Glon
The galactic longitude of the object, based on the IAU galactic coordinates system. This value was obtained from the computer (precessed) equatorial coordinates (1950). Units are degrees.

IAU_Glat
The galactic latitude of the object, based on the IAU galactic coordinates system. This value was obtained from the computer (precessed) equatorial coordinates (1950). Units are degrees.

Contact Person

Questions regarding the HIIREGION database table can be addressed to the HEASARC Help Desk.

Page Author: Browse Software Development Team
Last Modified: Monday, 16-Sep-2024 17:28:46 EDT