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Ridgway, Carbon, Hall, Jewell, ApJS, 54, 177 (1984)
οCet M5e-M9e
R And S6-6e
TX Psc C7.2
Late-type stars are hopeless for IR spectroscopy
Nagata, Hyland, Straw, Sato, Kawara, ApJ, 406, 501 (1993)
Usable stars (hot, bright YSOs) are few
H – K ≥ 1.4
Spitzer IRAC survey if the Galactic center
Ramírez, Arendt, Sellgren, Stolovy, Cotera, Smith, Yusef-Zadeh, ApJS 175, 147 (2008)
3.6 μm (L), 4.5 μm, 5.8 μm, 8.0 μm
Two micron all sky survey (2MASS) 1.25 μm (J), 1.65 μm (H), 2.16 μm (K)
Sources of stars
Skrutskie et al. ApJ, 131, 1163 (2006)
> 106
L < 7.5
- 1.2º < ℓ < 1.2 - 0.1º < b < 0.1º
→ 1420 →
J – K ~ 5K – L ~ 1.5
~ 300