2002ApJ...578..877S

Query : 2002ApJ...578..877S

2002ApJ...578..877S - Astrophys. J., 578, 877-884 (2002/October-3)

The intrinsic profile of the 4428 Å diffuse interstellar band.

SNOW T.P., ZUKOWSKI D. and MASSEY P.

Abstract (from CDS):

This paper presents high-quality CCD spectra (obtained at spectral resolving power λ/Δλ~2000) of the region surrounding the diffuse interstellar band (DIB) centered near 4428 Å, in some 35 O and early B stars located in the Cyg OB2 association. The reddenings of the stars range from E(B-V)~1.0 to 2.5 mag, allowing us to study the properties of the feature at high extinction, as compared with previous studies of DIBs in diffuse clouds. To our knowledge this is the first significant survey of the 4428 Å DIB profile to be based on CCD-quality spectra, allowing us to probe the properties of this feature with high accuracy. Among our conclusions are (1) the profile of λ4428 is symmetric and invariant within the uncertainties; (2) there is no clear-cut dependence of band properties on stellar spectral type; (3) the equivalent width of the 4428 Å DIB as a function of increasing extinction appears to level off at around E(B-V)~1.0; (4) there is no evidence for emission wings associated with λ4428; and (5) within the uncertainties the profile of the feature is fitted perfectly by a Lorentzian function, strongly suggesting that the band is broadened by natural damping. We conclude that the feature is created by rapid internal conversion in a molecular carrier.

Abstract Copyright: ∼

Journal keyword(s): ISM: Lines and Bands - ISM: Molecules

Simbad objects: 37

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Number of rows : 37
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1615 0
2 HD 183143 s*b 19 27 26.5636061496 +18 17 45.193019136 8.25 8.08 6.86 5.74 4.79 B7Iae 444 0
3 Schulte 1 SB* 20 31 10.544472 +41 31 53.52024 12.82 12.69 11.09 10.57   O8V+B 65 0
4 Schulte 2 V* 20 31 22.0268518920 +41 31 28.365740076 12.01 11.82 10.64     B1Ib: 65 0
5 Schulte 20 SB* 20 31 49.6575031512 +41 28 26.510600388 12.67 12.63 11.52     O9III+B 46 0
6 [MT91] 213 Psr 20 32 13.1247390384 +41 27 24.346666440 13.12 13.08 11.266     B0Vp 290 0
7 Schulte 15 SB* 20 32 27.6544131144 +41 26 22.073616744 12.39 12.30 11.10     O8V+B 52 0
8 Schulte 21 * 20 32 27.7375852104 +41 28 52.248099612 12.39 12.01 11.30 11.05   B0Ib 45 0
9 Schulte 16 * 20 32 38.5694704320 +41 25 13.776724056 12.05 11.88 11.12     O7.5IV(n) 51 0
10 BD+40 4221 * 20 32 45.4494231552 +41 25 37.543209348 12.06 11.93 10.68     O8.5V(n) 61 0
11 Schulte 17 SB* 20 32 50.0160775512 +41 23 44.684507976 13.15 12.43 11.33     O8V+O-G 44 0
12 Schulte 37 * 20 32 54.4064649768 +41 15 21.849647796 17.76 16.97 14.81     B3V 15 0
13 GSC 03161-01218 * 20 32 59.1773346576 +41 24 25.491471588 13.47 13.26 11.91     O8V 33 0
14 Schulte 41 SB* 20 32 59.6317342392 +41 15 14.679727632 16.54 15.59 13.49     O9.7III(n) 34 0
15 Schulte 22 SB* 20 33 08.799 +41 13 18.21 14.33 13.59 11.55     O3If*+O6V((f)) 72 0
16 RLP 678 EB* 20 33 10.5041613984 +41 22 22.405661292 14.97 14.54 12.958     B0V+(B3V+B6V) 40 0
17 Schulte 9 s*b 20 33 10.7362926720 +41 15 08.222370372 13.38 12.77 10.96     O5I+O4III 232 0
18 Ass Cyg OB 2 As* 20 33.2 +41 19           ~ 943 0
19 Schulte 7 * 20 33 14.1095938872 +41 20 21.904113804 12.24 12.00 10.55     O3If* 145 0
20 Schulte 23 * 20 33 15.7083033168 +41 20 17.174193540 14.21 14.07 12.61     O9V 38 0
21 Schulte 24 * 20 33 17.4825784080 +41 17 09.350977524 13.85 13.47 11.88     O8V(n) 47 0
22 RLP 680 SB* 20 33 18.0338622552 +41 21 36.661612428 13.9 12.72 11.82     O8V+B-O 38 0
23 Schulte 64 Be* 20 33 18.5309527200 +41 15 35.149489128 18.17 17.24 14.88     B1Ve-B3Ve 27 0
24 Schulte 25 * 20 33 25.564 +41 33 27.00 13.52 13.15 11.58     O8Vz 30 0
25 Schulte 74 SB* 20 33 30.3173970432 +41 35 57.893152056 15.04 14.41 12.51     O8V+B2-O 29 0
26 Schulte 18 * 20 33 30.7901427336 +41 15 22.693080852 13.38 12.54 10.860     B1I 49 0
27 Schulte 70 SB* 20 33 36.9940107864 +41 16 11.325832716 14.46 14.06 12.40     O9.5IV(n) 36 0
28 Schulte 19 s*b 20 33 39.1040288712 +41 19 25.992295824 12.91 12.77 10.944 10.38   B0Iab+B-O 70 0
29 EM* AS 428 SB* 20 33 39.7935831360 +41 22 52.188298860 13.17 12.21 11.38     B1V+B1: 35 0
30 GSC 03161-01086 * 20 33 40.8633896328 +41 30 18.953823168 14.61 14.32 12.77     O7V 27 0
31 BD+41 3804 s*b 20 33 46.1145474912 +41 33 00.991426968 11.82 11.41 9.88     O9.7Iab 103 0
32 Schulte 26 * 20 33 47.8316875224 +41 20 41.377739100 13.77 13.33 11.78     B1III 31 0
33 Schulte 27 SB* 20 33 59.5281120792 +41 17 35.477936340 14.44 13.97 12.203   10.250 O9.7V(n)+O9.7V(n) 50 0
34 Schulte 75 * 20 34 09.5115755136 +41 34 13.732080096 14.51 14.25 12.79     O9.5IV 27 0
35 Schulte 29 SB* 20 34 13.5108732672 +41 35 02.859602280 13.59 13.41 11.91     O7V+B-O 42 0
36 RLP 335 SB* 20 34 29.5987121592 +41 31 45.516383076 14.72 13.30 11.64     O7V+O9V 45 0
37 Schulte 30 Em* 20 34 43.5995109360 +41 29 04.799547924 14.13 13.83 12.240     B1.5III 35 0

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