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1992•The Astronomical JournalRequires access

A new member of the Local Group - The Tucana dwarf galaxy

Russell J. Lavery, Kenneth J. Mighell

Open publisher page 38 citations

Abstract

We present observations of the recently discovered dwarf galaxy in Tucana, which is a likely member of the Local Group. The system is highly flattened and we classify it as dE5. An upper limit on the distance modulus of 24.75 is determined from a V, V- I color-magnitude diagram. This galaxy has a B - R color of 1.1, and with the upper limit to the distance modulus, an absolute R magnitude of - 10. This apparently isolated dwarf system, being on the opposite side of the Milky Way from most of the Local Group, may provide important constraints on Local Group dynamics.

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What this paper is about

We present observations of the recently discovered dwarf galaxy in Tucana, which is a likely member of the Local Group. The system is highly flattened and we classify it as dE5. An upper limit on the distance modulus of 24.75 is determined from a V, V- I color-magnitude diagram. This galaxy has a B - R color of 1.1, and with the upper limit to the distance modulus, an absolute R magnitude of - 10. This apparently isolated dwarf system, being on the opposite side of the Milky Way from most of the Local Group, may provide important constraints on Local Group dynamics.

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Available abstract

We present observations of the recently discovered dwarf galaxy in Tucana, which is a likely member of the Local Group. The system is highly flattened and we classify it as dE5. An upper limit on the distance modulus of 24.75 is determined from a V, V- I color-magnitude diagram. This galaxy has a B - R color of 1.1, and with the upper limit to the distance modulus, an absolute R magnitude of - 10. This apparently isolated dwarf system, being on the opposite side of the Milky Way from most of the Local Group, may provide important constraints on Local Group dynamics.

Key concepts: Physics, Local Group, Dwarf galaxy, Dwarf spheroidal galaxy, Astronomy, Galaxy, Astrophysics, Group (periodic table)

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