HST/ACS Observations of Cepheid Variables in NGC 4258

Details HST/ACS Observations of Cepheid Variables in NGC 4258 HST/ACS Observations of Cepheid Variables in NGC 4258

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...205.7302m&link_type=abstract

American Astronomical Society Meeting 205, #73.02; Bulletin of the American Astronomical Society, Vol. 36, p.1469

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We present the discovery of Cepheid variables in the spiral galaxy NGC 4258, a key galaxy for the absolute calbration of the Extragalactic Distance Scale.
The data was obtained using the Advanced Camera for Surveys onboard the Hubble Space Telescope. We observed two fields using the B, V and I filters on twelve epochs over a period of 46 days. We used the DAOPHOT/ALLFRAME software package to perform PSF-fitting photometry and detected about 2x105, 4x105 and 7x105 stars in B, V and I, respectively, with completeness limits of B 27 mag, V 26.5 mag and I 26 mag. We discovered over 300 Cepheids with periods ranging from 3 to 48 days, a significant improvement over the previous sample of 15 Cepheids discovered with HST/WFPC2.
We present color-magnitude diagrams for the complete stellar sample and Period-Luminosity relations for the Cepheid variables in both fields, and discuss the distance estimated from them. This forms one of three presentations that describe distance estimates to NGC 4258 and ramifications for the extragalactic distance scale. This research has been funded in part by NASA grants HST-GO-09810.01-A and HST-HF-01153.01-A.

Affiliated with

Also associated with

No associations

Rating

HST/ACS Observations of Cepheid Variables in NGC 4258 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 HST/ACS Observations of Cepheid Variables in NGC 4258, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and HST/ACS Observations of Cepheid Variables in NGC 4258 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1641310