Diapositiva PPT
- 2763 of these stars were observed by IRAS, but only 64 of these are AV stars, and most of the stars (about 99%) have V magnitude ? 10 (Nɞ for a late K star).
- No cluster star was observed by IRAS.
- 881 of the Hipparcos stars were observed by MSX. Of these 232 of the sample of 2022 Hipparcos stars are north of ??????.
Note that the histogram of the distribution of spectral types
suggests that many of the A stars used are wrongly classified.
We expect to find more A5V stars than A0V because the
mass function increases to lower mass, but we see many
more stars classified as A0V than as A5V.
? We must check the classification of the stars that we select!