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Post Info TOPIC: NGC 2451 A and B


Posts: 131433
NGC 2451

NGC 2451 (also OCL 716 and ESO 311-SC8) is a magnitude +2.8 open cluster located in the constellation Puppis.
NGC 2451 is actually two line-of-sight clusters (NGC 2451A and B) about 197 or 358 parsecs (642 - 1168 light-years) away from the Earth.

The cluster was discovered by English astronomer John Herschel using a 47.5 cm (18.7 inch) reflecting telescope at the Cape of Good Hope, on the 1st February 1835.

The cluster was likely first discovered by Giovanni Battista Hodierna in 1654.

Right Ascension 07h 45m 24.0s, Declination -37 57' 00"

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Posts: 131433
NGC 2451 A and B

Title: SPITZER/IRAC-MIPS Survey of NGC2451A and B: Debris Disks at 50-80 million years
Authors: Zoltan Balog, Laszlo L. Kiss, Jozsef Vinko, G. H. Rieke, James Muzerolle, Andras Gaspar, Erick T. Young, Nadya Gorlova

We present a Spitzer IRAC and MIPS survey of NGC 2451 A and B, two open clusters in the 50-80 Myr age range. We complement these data with extensive ground-based photometry and spectroscopy to identify the cluster members in the Spitzer survey field. We find only two members with 8 micron excesses. The incidence of excesses at 24 microns is much higher, 11 of 31 solar-like stars and 1 of 7 early-type (A) stars. This work nearly completes the debris disk surveys with Spitzer of clusters in the 30-130 Myr range. This range is of interest because it is when large planetesimal collisions may have still been relatively common (as indicated by the one that led to the formation of the Moon during this period of the evolution of the Solar System). We review the full set of surveys and find that there are only three possible cases out of about 250 roughly solar-mass stars where very large excesses suggest that such collisions have occurred recently.

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