Physics
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993hst..prop.4277s&link_type=abstract
HST Proposal ID #4277
Physics
Hst Proposal Id #4277
Scientific paper
We propose to proceed to the next step in the program (cycle 1 GO-2547) to determine Cepheid distances to nearby, highly resolved galaxies that have produ- ced Type-Ia supernovae (SNIa). The feasibility of the program has been demonstrated by our results for IC 4182. The prediction in the Cycle 1 proposal that many Cepheids would be found in IC4182 brighter than V=25.5 with periods as short as 3 days has been confirmed (Fig. 1 here). Based on the P-L relation from 27 Cepheids found from the Cycle 1 data, the apparent distance modulus to IC4182 is 28.47, and the peak absolute magnitude in V for SNIa 1937C = -19.92 +/- 0.1, independent of everything but differential absorption between the SN and the Cepheids. It is necessary to measure this value for several SNIa to determine the mean value and intrinsic dispersion of M(max) for SNIa. For the next target we propose to observe the amorphous galaxy NGC 5253 that produced the two SNIa 1895B and 1972E. Photometry in V, R, and I will determine the internal absorption of the Cepheids individually, giving the true modulus of NGC 5253. The internal absorption of SN1972E is known to be small, as shown by the blue color of (B-V)=-.08. Based on our experience with IC 4182, accounting for the similar predicted distance for NGC 5253, and noting that ground observations show the presence of many luminous blue supergiants, we expect to find a similar number of Cepheids as found in IC 4182. This project is therefore feasible with HST in its present status.
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