The distance to the Pegasus Dwarf Irregular Galaxy: an open question

Bibcode
1994ApJ...437L..27A
DOI
10.1086/187674
Aparicio, A.
Referencia bibliográfica

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 437, no. 1, p. L27-L30

Fecha de publicación:
12
1994
Revista
Astrophysical Journal
Número de autores
1
Número de autores del IAC
1
Número de citas
38
Número de citas referidas
35
Descripción
The distance of the Pegasus Dwarf Irregular Galaxy is discussed in the light of new, deep photometry of the resolved stars taken in the bands V, R, and I of the Johnson-Cousins system. The tip of the red giant branch is identified beyond doubt. From its position, a distance modulus of (m - M)0 = 24.9 +/- 0.1 is derived, in disagreement with the previous estimate by Hoessel et al., based on Cepheid light curves (m - M)0 = 26.22 +/- 0.2). The new estimate of (m - M)0 = 24.9 implies that Pegasus is at about 0.64 Mpc from the center of gravity of the Local Group. This distance makes Pegasus a highly probable member of the Local Group and is consistent with the heliocentric velocity of this galaxy. Finally, a list of six Cepheid candidates is given on the basis of the new photometry.
Tipo
Con árbitro
Galaxias enanas
Galaxias irregulares

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