Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aj....124.2164a&link_type=abstract
The Astronomical Journal, Volume 124, Issue 4, pp. 2164-2177.
Astronomy and Astrophysics
Astronomy
21
Ism: Individual: Alphanumeric: L1457
Scientific paper
We present a spectroscopic and photometric survey of a sample of field stars in the region of the molecular cloud L1457. High-quality coudé feed spectra, together with five-band photometry in the Sloan Digital Sky Survey system and near-infrared archival data from the Two Micron All Sky Survey, are used to derive color excesses and distances for the stars. Based on these data, a new distance estimate of 360+/-30 pc is derived for the cloud, supporting recent results by K. L. Luhman. The data further indicate that the north-south velocity gradient seen in the millimeter-wave CO data is mirrored in a distance gradient, with the northern part of the cloud being closer to us. A second, less opaque, layer of extinction is detected at ~80 pc. This distance is consistent with the earlier distance estimates to the cloud, based on Na I absorption. We identify this layer with the wall of the hot Local Bubble. Hence, the dense cloud is not, as previously thought, associated with the Local Bubble.
Andersson Bengt-Goran
Chen Bohui
Idzi Rafal
Jorgensen Anders Moller
Uomoto Alan
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