Comparison of two different extinction laws with Hipparcos observations

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dc.creatorChen, Bing
dc.creatorVergely, Jean Luc
dc.creatorValette, Bernard
dc.creatorCarraro, Giovanni
dc.date1998-05-04
dc.date.accessioned2026-07-07T02:26:45Z
dc.date.available2026-07-07T02:26:45Z
dc.descriptionInterstellar absorption in the galactic plane is highly variable from one direction to another. In this paper colour excesses and distances from a new open cluster sample are used to investigate the spatial distribution of the interstellar extinction. An inverse method (Tarantola & Valette, 1982) is used to construct the extinction map in the galactic plane below $|b| < 10^{o}$. The $A_{v} (r,l) $ diagrams are compared with those derived from individual stars (Arenou et al. 1992, Neckel & Klare 1980). An analytic expression for the interstellar extinction as a function of galactic longitude and distance in the solar neighborhood is given. The comparison of the model predictions with Hipparcos observations in the 4-dimensional space of ($V$, $B-V$, $H_v$, $r$) shows that our extinction model provides a better fit to the data. However, a new and more detailed extinction model is still lacking.
dc.description16 pages, 16 figures, latex, accepted for pubblication in Astronomy and Astrophysics Main Journal
dc.identifierhttps://arxiv.org/abs/astro-ph/9805018
dc.identifierhttp://arxiv.org/abs/astro-ph/9805018
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/12400
dc.subjectAstrophysics
dc.titleComparison of two different extinction laws with Hipparcos observations
dc.typetext

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