NICMOS Spectrophotometry and Models for A-Stars

Details NICMOS Spectrophotometry and Models for A-Stars NICMOS Spectrophotometry and Models for A-Stars

2008-07-17

arxiv.org/abs/0807.2782v1

Astronomy and Astrophysics

Astrophysics

20 pages, 6 figures, 2 tables; to be published in AJ, 2008 September

Scientific paper

10.1088/0004-6256/136/3/1171

Absolute flux distributions for eight stars are well measured from 0.8-2.5mu m with NICMOS grism spectrophotometry at a resolution of R~100 and an accuracy of 1-2%. These SEDs are fit with Castelli & Kurucz model atmospheres; and the results are compared with the Cohen-Walker-Witteborn (CWW) template models for the same stars. In some cases, the T_{eff}, log g, and log z parameters of the best fitting model differ by up to 1000 K from the earlier CWW model. However, differences in the continua of the modeled IR flux distributions from 0.4-40mu m are always less than the quoted CWW uncertainty of 5% because of compensating changes in the measured extinction. At wavelengths longward of the 2.5mu m NICMOS limit, uncertainties still approach 5%, because A-star models are not yet perfect. All of these A stars lie in the JWST continuous viewing zone and will be important absolute flux standards for the 0.8-30mu m JWST wavelength range.

Affiliated with

Also associated with

No associations

Rating

NICMOS Spectrophotometry and Models for A-Stars does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with NICMOS Spectrophotometry and Models for A-Stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and NICMOS Spectrophotometry and Models for A-Stars will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-42452