Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21934912b&link_type=abstract
American Astronomical Society, AAS Meeting #219, #349.12
Astronomy and Astrophysics
Astronomy
Scientific paper
The HII region Sh2-231 is thought to belong to the Auriga OB1 association, together with other emission nebulae, Sh2-232, Sh2-233 and Sh2-235, all within 1 square degree. The area is surrounded by a giant molecular cloud G173.7+02.7 also known as a dust cloud LDN 1525 or TGU 1192. Distances estimated from the exciting stars of the HII regions are known with low accuracy (between 1.0 and 2.3 kpc). Most authors consider that all listed HII regions are related to the association Aur OB1: the mean distance of its stars is 1.3 kpc. In our earlier paper (Straizys et al., Baltic Astronomy, 19, 169, 2010) we argued the Sh2-231 nebula might not be related to the association. More probably this nebula is in the Perseus arm seen semi-transparently through the dust cloud TGU 1192.
We investigate the 12' by 12' area using the VATT telescope with a 4K CCD camera and seven filters of the Vilnius photometric system to determine spectral and luminosity classes, interstellar reddenings, extinctions and distances for the field stars down to V = 17 mag. Thus we learn the distance to the dust cloud and its relation to the nebula Sh2-231. IPHAS and MegaCam photometry provides spectral types for fainter stars.
Both Vilnius and IPHAS photometric data are in agreement that the dust cloud in the direction of Sh2-231 begins at a distance of about 1.3 kpc, i.e., it is undoubtedly related to the Aur OB1 association. The extinction Av in the cloud ranges between 1.5 and 4.5 mag. However, the star ALS 8476 (O9 V, V = 10.79, Av = 3.6, d = 2.3 kpc) is too far to be related to the Aur OB1 star-forming region. Consequently, if this star is the exciting source of Sh2-231, the nebula belongs to the Perseus arm.
Boyle Richard P.
Janusz Robert
Laugalys V.
Straizys Vytautas
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