SIMBAD references

2006A&A...446..551J - Astronomy and Astrophysics, volume 446, 551-560 (2006/2-1)

Extinction at 7µm and 15µm from the ISOGAL survey.


Abstract (from CDS):

The extinction laws at 7µm and 15µm are derived for more than 120 sightlines in the inner Galactic plane based on the ISOGAL survey data and the near-infrared data from DENIS and 2MASS. The tracers are the ISOGAL point sources with [7]-[15]<0.4 which are RGB tip stars or early AGB stars with moderate mass loss. They have well-defined intrinsic color indices (J-Ks)0, (Ks-[7])0 and (Ks-[15])0. By a linear fitting of the observed color indices Ks-[7] and Ks-[15] to the observed J-Ks, we obtain the ratio between the E(Ks-[7]) and E(Ks-[15]) color excesses and E(J-Ks). We infer the selective extinctions at 7 and 15µm in terms of the near-infrared extinction in the Ks band. The distribution of the derived extinctions around 7 micron (A7) is well represented by a Gaussian function, with the peak at about 0.47AKs and ranging from 0.33 to 0.55AKs. There is some evidence that A7/AKs may vary significantly depending on the line of sight. The derived selective extinction at 15µm suffers uncertainty mainly from the dispersion in the intrinsic color index (Ks-[15])0 which is affected by dust emission from mass-losing AGB stars. The peak value of A15 is around 0.40AKs.

Abstract Copyright:

Journal keyword(s): stars: AGB and post-AGB - stars: late-type - stars: mass loss - ISM: dust, extinction - infrared: ISM - infrared: stars

VizieR on-line data: <Available at CDS (J/A+A/446/551): ext7.dat ext15.dat iso2mass.dat>

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 4

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