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The luminosity-specific Planetary Nebulae density in Local Group galaxies

Published online by Cambridge University Press:  15 December 2006

R.L.M. Corradi ,
A. Buzzoni  and
M. Arnaboldi
R.L.M. Corradi
Affiliation:
Isaac Newton Group of Telescopes, Ap. de Correos 321, 38700 Sta. Cruz de la Palma, Spain email: rcorradi@ing.iac.es Instituto de Astrofísica de Canarias, 38200 La Laguna, Tenerife, Spain
A. Buzzoni
Affiliation:
INAF Osservatorio Astronomico di Bologna, Via Ranzani 1, 40127 Bologna, Italy email: alberto.buzzoni@bo.astro.it
M. Arnaboldi
Affiliation:
ESO Karl-Schwarzschild-Str. 2, 85748 Garching bei München, Germany email: marnabol@eso.org INAF Osservatorio Astronomico di Torino, Via Osservatorio 20, 10025 Pino Torinese (To), Italy
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Abstract

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The value of the $\alpha$ ratio, the number of PNe per unit bolometric luminosity in a galaxy, is computed using stellar population synthesis models covering the whole range of Hubble types of galaxies.

Model predictions are compared with the PNe counts in the Local Group, which indicate a fairly constant value of $\alpha$ – between 1 and 6 PNe per 10$^7$ solar luminosities – along the Hubble sequence.

Keywords

planetary nebulaegeneralgalaxies: stellar content
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S234: Planetary Nebulae in our Galaxy and Beyond , April 2006 , pp. 383 - 384
Copyright
© 2006 International Astronomical Union