TY - JOUR
T1 - Protostars in the Elephant Trunk Nebula
AU - Reach, William T.
AU - Rho, Jeonghee
AU - Young, Erick
AU - Fajardo-Acosta, Sergio
AU - Muzerolle, James
AU - Sicilia-Aguilar, Aurora
AU - Hartmann, Lee
AU - Allen, Lori
AU - Carey, Sean
AU - Cuillandre, Jean-Charles
AU - Jarrett, Thomas H.
AU - Lowrance, Patrick
AU - Marston, Anthony
AU - Noriega-Crespo, Alberto
AU - Hurt, Robert L.
PY - 2004/9
Y1 - 2004/9
N2 - The optically dark globule IC 1396A is revealed using Spitzer Space Telescope images at 3.6, 4.5, 5.8, 8, and 24 mum to be infrared-bright and to contain a set of previously unknown protostars. The mid-infrared colors of the 24 mum detected sources indicate several very young (Class I or 0) protostars and a dozen Class II stars. Three of the new sources (IC 1396A:gamma, 1396A:delta, and 1396A:epsilon) emit over 90% of their bolometric luminosities at wavelengths greater than 3 mum, and they are located within similar to0.02 pc of the ionization front at the edge of the globule. Many of the sources have spectra that are still rising at 24 mum. The two previously known young stars LkHalpha 349a and 349c are both detected, with component c harboring a massive disk and component a being bare. On the order of 5% of the mass of material in the globule is presently in the form of protostars in the 10(5)-10(6) yr age range. This high star formation rate was likely triggered by radiation from a nearby O star.
AB - The optically dark globule IC 1396A is revealed using Spitzer Space Telescope images at 3.6, 4.5, 5.8, 8, and 24 mum to be infrared-bright and to contain a set of previously unknown protostars. The mid-infrared colors of the 24 mum detected sources indicate several very young (Class I or 0) protostars and a dozen Class II stars. Three of the new sources (IC 1396A:gamma, 1396A:delta, and 1396A:epsilon) emit over 90% of their bolometric luminosities at wavelengths greater than 3 mum, and they are located within similar to0.02 pc of the ionization front at the edge of the globule. Many of the sources have spectra that are still rising at 24 mum. The two previously known young stars LkHalpha 349a and 349c are both detected, with component c harboring a massive disk and component a being bare. On the order of 5% of the mass of material in the globule is presently in the form of protostars in the 10(5)-10(6) yr age range. This high star formation rate was likely triggered by radiation from a nearby O star.
KW - ISM : globules ISM : individual (IC 1396A) infrared : ISM MAIN-SEQUENCE EVOLUTION COMETARY GLOBULES MOLECULAR CLOUDS IC 1396 IC-1396 STARS
U2 - 10.1086/422193
DO - 10.1086/422193
M3 - Article
SN - 1538-4365
VL - 154
SP - 385
EP - 390
JO - Astrophysical Journal Supplement
JF - Astrophysical Journal Supplement
IS - 1
ER -