THE STAR FORMATION NEWSLETTER No. 266 (#36-4) ( ) 17 Apr. 21
The Spatial Structure of Young Stellar Clousters. II. Total Young Stellar Populations M.I.A. Kuhn et al. MYStIX stellar population 2 MYStIX: Massive Young Star-forming complex Study in Infrared and X-ray Chandra X 2MASS,Spitzer IR (MPCM ) d<3.6 kpc Paper1 (cluster,isolated) scale threshold [Bressert+2] =>
log N [stars] (IMF) 1. 1. 2. 2. 3. 3. 1. 1. 2. 2. 3. 3. log N [stars] (XLF) XLF IMF stellar population => X RCW38
=> Number of Stars 3 4 3 1 8 6 4 Orion NGC2264 DR21 1 Flame 8 6 4 1 8 6 4 Rosette RCW38 W4 1 Lagoon 8 6 4 NGC6334 1 RCW36 8 6 4 2 1 NGC2362 NGC637 1 Eagle 1 1 M17 8 6 4 Carina 8 6 4 Trifid 8 6 4 NGC1893 1 1 2 3 4 1 1 2 3 4 1 1 2 3 4 log Surface Density [stars pc 2 ] 1 1 2 3 4 Paper1 => 8-9% subcluster =
Gaia-ESO Survey: The analysis of pre-main sequence stellar spectra A.C. Lanzafame et al. Gaia-ESO Public Spectroscopy Survey VLT FRAMES ~ radial velocity 18 UVES GIRAFFE GIRAFFE: F~M PMS MS (12<V<9mag) UVES: G-K (9<V<1mag) SN on-going
Sulfur-Bearing Molecules in Massive Star-Forming Regions: Observations of OCS, CS, H2S and SO J. Li et al. S =>S chemical clock S warm gas CSO m 23GHz OCS,O13CS,13CS,H2S,SO, C18O 36 / HII ( )
CH3CN ( ) => : HII-HC, HII-only OCS =>τ~-16 LTE, Tex=K τ =>
(a) H 2 for H II HC (c) CS for H II HC (e) OCS for H II HC (g) H 2 S for H II HC (i) SO for H II HC ( ) ( ) 22 23 24 13 14 1 14 16 13 14 1 16 13 14 1 Number of Sources (b) H 2 for H II only 22 23 24 log (Column Density) [cm 2 ] (d) CS for H II only 13 14 1 (f) OCS for H II only 14 16 (h) H 2 S for H II only 13 14 1 16 (j) SO for H II only 13 14 1 - -S H2S (a) CS for H II HC (c) OCS for H II HC (e) H 2 S for H II HC (g) SO for H II HC 9. 9 8. 8 9 8 7 9 8 7 9 8 (Table7) Number of Sources (b) CS for H II only 9. 9 8. 8 log (abundance) (d) OCS for H II only 9 8 7 (f) H 2 S for H II only 9 8 7 (h) SO for H II only 9 8 OrionKL [Esplunges+214] [OCS]/[H2S], [CS]/[H2S], [SO]/[OCS], [CS]/[SO], [OCS]/[CS] HII-HC 7-8yr
Search for methylamine in high mass hot cores N.F.W. Ligterink et al. (CH3NH2) => non-detection UV [Garrod+8] CO ice (NH2CHO) JCMT UV or thermal interaction CO ice 23-26GHz 2~21 ~mk 9 Trot=12K
Source N S,CH3 NH 2 CH 3 NH 2 /NH 2 CHO CH 3 NH 2 /CH 3 OH NH 2 CHO/CH 3 OH NH 2 CHO upper /CH 3 OH cm 2 Model F 1.1 3.4E-2 3.1E-2 3.1E-2 Model M 1.7 1.E-1 7.3E-2 7.3E-2 Model S 1.3 1.3E-1 1.E-1 1.E-1 AFGL 291 <1.9E+16 - - <3.9E-1 - G24.78 <2.4E+16 <3.3E+1 <8.E-2 2.6E-3 9.E-4 G31.41+.31 <.8E+16 <2.8E+1 <4.9E-2 1.8E-3 3.8E-3 G7.78 <3.E+16 <1.7E+2 <3.1E-1 1.8E-3 2.6E-2 IRAS 1889-1732 <4.2E+16 <.E+1 <1.9E-1 3.8E-3 7.9E-3 IRAS 2216+44 <6.4E+16 - <2.2 - - NGC 738 IRS1 <2.E+16 <3.E+1 <1.8E-1 4.8E-3 2.1E-4 W3(H 2 O) <.E+16 <3.9E+1 <.E-2 1.3E-3 6.4E-4 W3(H 2 O)* <1.7E+16 <1.3E+1 <1.7E-2 1.3E-3 6.4E-4 W 33A <.7E+16 <2.7E+1 <2.9E-1 1.1E-2 4.6E-3 Sgr B2 a 1.2E+14.7E-1 1.7E-2 1.3E-2 Sgr B2(M) b 4.E+16 3.2 1.7E-2.2E-3 Sgr B2(N) b 6.E+17 4.3E-1 3.3E-2 7.8E-2 Sgr B2(N) c.e+17 2.1 1.E-1 4.8E-2 Orion Compact Ridge d - - - 1.6E-3 Garrod+8 Sgr B2 Orion CH3NH2/NH2CHO consistent CH3NH2/ CH3OH = CH3NH2 NH2CHO/CH3OH
(CH3CN) CH3*+CH*->CH3CN CH3NH2 CH3NH2/CH3CN CH3CN/CH3OH => CH3CN Source CH 3 NH 2 /CH 3 CN CH 3 CN/CH 3 OH Model F.E+1 6.3E-4 Model M 3.8E+1 2.6E-3 Model S 1.E+1 8.6E-3 AFGL 291 <.3 <7.E-2 G24.78 <.1E-1 2.1E-1 G31.41+.31 <3.6.9E-2* G7.78 <1.9E+1 1.6E-2 IRAS 1889-1732 <8.9 1.1E-2* IRAS 2216+44 <4.3E+1.2E-2 NGC 738 IRS1 <2. 6.8E-2 W3(H 2 O) <7.2 7.E-3 W 33A <2.1 1.4E-1 Sgr B2 a 1.2 1.E-2 Sgr B2(N) b 3.E-1 1.1E-1 Sgr B2(M) b 2.E-1 6.7E-2 Sgr B2(N) c.9e+1 1.7E-2 Orion Compact Ridge d - 1.1E-2 s t a 6 W l u F ( p a Garrod+8 CH3NH2 NH2CHO CH3CN CH4 NH3 photodissociation CH3,NH2 overproduce & ALMA CH3NH2 =>W33A 1
A long-lasting quiescence phase of the eruptive variable V1118 Ori D. Lorenzetti et al. EXor V1118Ori (~8 ) V1118Ori NIR imaging 1.1m AZT24m Optical spectroscopy 8.4m LBT (R=) 3.6m TNG (R=7) NIR spectroscopy 3.6m TNG (R=) NIR J
Av=1~2 extinction raw =>Av additional component? [Lorenzetti+212]
( optical) accretion driven cooling/heating