Candidates for promising extinction distances - SH 1-89, NGC 7048, and M 1-77

Details Candidates for promising extinction distances - SH 1-89, NGC 7048, and M 1-77 Candidates for promising extinction distances - SH 1-89, NGC 7048, and M 1-77

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26as...72..383h&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 72, no. 3, March 1988, p. 383-390.

Astronomy and Astrophysics

Astrophysics

4

Astronomical Photometry, Interstellar Extinction, Planetary Nebulae, B Stars, Distance, O Stars, Ubv Spectra

Scientific paper

Photometric measurements of about 300 stars within 15 arcmin of one of three nearby PN, obtained using an iris photometer on Asiago Observatory 90-60-cm Schmidt-telescope UBV plates, are presented in tables and graphs and analyzed. Extinction-distance relations are established on the basis of the data for a number of highly reddened OB candidates, and the PN distances are estimated as 500 + or - 150 pc or 2.0 + or - 0.5 kpc (depending on the extinction value accepted) for SH 1-89, 1.6 + or - 0.5 kpc for NGC 7048, and 2.5 + or - 1 kpc for M 1-77. The lines of sight toward these PN are characterized by onset of dust extinction at about 400 pc and a dust-free zone out to about 1.5 kpc.

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