The OH Sky Line Database

Last Update: 4 December 1997

The main reference used for this line list intensity is Maihara et al
(1993) with Olivia & Origilia (1992) filling up some lines in the
short and long wavelength ends of the 1-2 microns range. Some fine
tuning of the original data was done by de-blending a few lines. Some
patterns are regular (e.g. P1 is three times brighter than P2). Line
intensities are variable and references in the literature do disagree
(e.g. Maihara et al (1993) is middle of the road, Olivia & Origilia
(1992) are factor of two lower, while Ramsey et al (1992) records
intensities of 3-4 higher. The strength of the OH lines is most likely
site dependent and is definitely time dependent. As to the measurement
of the continuum between the lines, Tom Herbst (1994) does a good job
at collating information. With OH suppression, the actual continuum
left after the lines are masks is the limiting background, so it will
be important to measure the continuum at the site.

1. The first three columns give the line identification. The P and R
   branch lines are doublet while the Q-branch lines are
   quadruplet. The nomenclature used is Chamberlain (1955), except
   lines shortward of 1.0729 micron which use Herzburg (1955)
   notation.

2. The fourth columns gives the line position in angstroms. Most of
   these numbers are derived from the molecular constants given in
   Abrams et al (1994). Maihara et al. wavelengths for the Q-branch
   lines which are very close to the theoretical positions of the Q1
   lines are used.

3. The fifth column gives the difference between the two members of
   the doublet (all the lines listed are in fact doublets unresolvable
   at R < 100000 which is also the expected thermal and pressure
   broadening width of these lines) or the two extreme members of the
   quadruplet in angstroms (for the Q-branch lines).

4. The sixth column gives the intensity of the lines in
   photons*s-1*m-2*arcsec-2. Some lines are kept without
   intensities. These might be contributing significantly to the
   strength of another nearby line. For these lines, all the strength
   of the line was assigned to one of the two possible members of the
   blends. The choice was made by realizing that the observed
   wavelengths as given in Maihara et al. almost exactly coincided
   with one of the two lines (obviously the main contributor). Lines
   shorter than 1.0728 micron are taken from Osterbrock et al (1996)
   and have been assigned relative intensities based on their
   measurements with a scale appropriate to each order, most likely
   underestimated. Then again, these line intensities due vary with
   location and time.

Questions or comments about the above to Kim Ennico
kennico@ast.cam.ac.uk Last modified: 4 December 1997


OH Skylines
9-5 P2 (2.5) 10103.6 - 3.75 *scale1
9-5 P1e,f (3.5) 10124 0.2 7 *scale1
9-5 P2 (3.5) 10153 - 3 *scale1
9-5 P1e,f (4.5) 10171.7 0.4 4.3 *scale1
4-1 R2 (2.5) 10181 - 0.9 *scale1
4-1 R1 (2.5) 10189.7 - 4.9 *scale1
4-1 R1 (1.5) 10203 - 2.25 *scale1
9-5 P2 (4.5) 10208.8 - 1.75 *scale1
4-1 R1 (1.5) 10211 - 7.5 *scale1
9-5 P1e,f (5.5) 10225.8 0.6 2 *scale1
4-1 R2 (0.5) 10230.7 - 2.1 *scale1
4-1 Q1 (1.5) 10286.6 - 9.75 *scale1
4-1 Q1e,f (2.5) 10296 0.4 1.8 *scale1
4-1 P2 (1.5) 10347.3 - 0.2 *scale2
4-1 P1 (2.5) 10372.9 - 1 *scale2
4-1 P2 (2.5) 10396.5 - 0.375 *scale2
4-1 P1e,f (3.5) 10418.4 0.3 0.7 *scale2
4-1 P2 (3.5) 10450.5 - 0.25 *scale2
4-1 P1e,f (4.5) 10468.9 0.5 0.25 *scale2
5-2 R1 (1) 10728.8 0.1 12
5-2 R2 (1) 10743.2 0 4
5-2 R1 (0) 10751 0.1 49
5-2 R2 (0) 10772.1 0.1 16
5-2 Q2 (1) 10829.3 0 15
5-2 Q1 (1) 10831.3 0 45
5-2 Q2 (2) 10837.8 0 5.5
5-2 Q1 (2) 10841.7 0.1 16.5
5-2 P2 (1) 10895.7 0.1 11
5-2 P1 (1) 10923.4 0.2 27
5-2 P2 (2) 10948.4 0.1 11
5-2 P1 (2) 10972.3 0.3 39
5-2 P2 (3) 11006.3 0 11
5-2 P1 (3) 11026.8 0.5 28
5-2 P2 (4) 11069.4 0.2 8
5-2 P1 (4) 11087 0.7 17
5-2 P2 (5) 11137.9 0.3 1
5-2 P1 (5) 11153 0.9 4
6-3 R1 (2) 11309.8 0.2 3
6-3 R1 (1) 11328.1 0.1 6
6-3 R1 (0) 11351.1 0.1 3
6-3 Q2 (1) 11434.6 0 5.5
6-3 Q1 (1) 11436.8 0 16.5
6-3 Q2 (2) 11444.1 0.1 4.25
6-3 Q1 (2) 11448.5 0.1 12.75
6-3 P2 (1) 11505.5 0.2 3
6-3 P1 (1) 11535.6 0.2 45
6-3 P2 (2) 11562.1 0.1 3
6-3 P1 (2) 11588.5 0.3 54
6-3 P2 (3) 11624.7 0 11
6-3 P1 (3) 11647.6 0.5 38
6-3 P2 (4) 11693.2 0.2 6
6-3 P1 (4) 11712.9 0.7 92
6-3 P2 (5) 11767.6 0.4 2
6-3 P1 (5) 11784.8 0.9 7
6-3 P2 (6) 11848.2 0.5 1
6-3 P1 (6) 11863.3 1.2 3
7-4 R1 (3) 11972.6 0.2 25
7-4 R2 (3) 11980 0.2 2
7-4 R1 (2) 11985.4 0.2 30
7-4 R2 (2) 11996.9 0.1 11
7-4 R1 (1) 12003.8 0.1 44
7-4 R2 (1) 12021 0 25
7-4 R1 (0) 12027.6 0.1 85
7-4 R2 (0) 12052.6 0.1 26
7-4 Q2 (1) 12117.1 0 27.75
7-4 Q1 (1) 12119.3 0 83.25
7-4 Q2 (2) 12127.8 0.1 10
7-4 Q1 (2) 12132.6 0.1 30
7-4 Q2 (3) 12145.4 0.1 4.5
7-4 Q1 (3) 12151.6 0.1 13.5
7-4 P2 (1) 12193.1 0.2 38
7-4 P1 (1) 12225.9 0.2 109
7-4 P2 (2) 12254.4 0.1 59
7-4 P1 (2) 12283.6 0.3 113
7-4 P2 (3) 12322.5 0 22
7-4 P1 (3) 12348.2 0.5 82
7-4 P2 (4) 12397.5 0.2 6
7-4 P1 (4) 12419.9 0.8 114
7-4 P2 (5) 12479.3 0.4 3
7-4 P1 (5) 12499 1 31
7-4 P1 (6) 12585.5 1.3 4
O2 - - 12685.7 - 80
O2 - - 12695.1 - 64
O2 - - 12702 - 37
O2 - - 12714 - 39
O2 - - 12726.1 - 20
O2 - - 12744.6 - 24
8-5 R1 (3) 12749.3 0.1 45
8-5 R1 (2) 12760.9 0.1 76
O2 - - 12776 - 32
8-5 R1 (1) 12779.1 0.1 149
O2 - - 12798 - 57
8-5 R1 (0) 12803.5 0.1 107
O2 - - 12824.8 - 25
8-5 R2 (0) 12831.1 0.1 58
O2 - - 12845 - 35
O2 - - 12866 - 31
8-5 Q2 (1) 12900 0.1 65.25
8-5 Q1 (1) 12902.2 0 185.75
8-5 Q2 (2) 12912.3 0.1 21
8-5 Q1 (2) 12917.6 0.1 63
8-5 Q2 (3) 12932.5 0.1 6.5
8-5 Q1 (3) 12939.6 0.2 19.5
8-5 P2 (1) 12982.1 0.2 67
8-5 P1 (1) 13018.1 0.2 187
8-5 P2 (2) 13049.2 0.1 82
8-5 P1 (2) 13081.7 0.4 277
8-5 P2 (3) 13124.2 0 99
8-5 P1 (3) 13153.2 0.6 77
8-5 P2 (4) 13207.2 0.2 47
8-5 P1 (4) 13232.9 0.8 104
8-5 P1 (5) 13321 1.1 29
8-5 P1 (6) 13417.9 1.4 26
2-0 P2 (1) 14465.2 0.2 7
2-0 P1 (1) 14515 0.3 22
2-0 P2 (2) 14560 0.1 12
2-0 P1 (2) 14600.8 0.6 19
2-0 P2 (3) 14661.1 0.2 5
2-0 P1 (3) 14694.4 0.9 15
3-1 R1 (3) 14736 0.6 6
3-1 R1 (2) 14779.7 0.5 13
2-0 P1 (4) 14795.8 1.2 2
3-1 R2 (2) 14801.7 0.2 13
3-1 R1 (1) 14829 0.4 22
3-1 R2 (1) 14860.3 0 6
3-1 R1 (0) 14883.6 0.2 30
2-0 P1 (5) 14905 1.5 4
3-1 R2 (0) 14927.8 0.2 9
3-1 Q2 (1) 15048.8 0 25.5
3-1 Q1 (1) 15051.4 0 76.5
3-1 Q2 (2) 15059.9 0.1 9.5
3-1 Q1 (2) 15064.8 0.1 28.5
3-1 Q2 (3) 15078.1 0 2.75
3-1 Q1 (3) 15084.2 0.1 8.25
3-1 P2 (1) 15183 0.3 20
3-1 P1 (1) 15236.8 0.3 90
3-1 P2 (2) 15283.6 0.1 45
3-1 P1 (2) 15328.2 0.6 177
3-1 P2 (3) 15391.1 0.2 54
3-1 P1 (3) 15427.9 0.9 163
4-2 R1 (4) 15457.9 0.6 4
4-2 R1 (3) 15496.6 0.6 17
3-1 P2 (4) 15505.5 0.4 44
4-2 R2 (3) 15513.6 0.3 20
3-1 P1 (4) 15536.1 1.2 71
4-2 R1 (2) 15541.9 0.5 44
4-2 R2 (2) 15565.9 0.2 32
4-2 R1 (1) 15593.4 0.4 113
3-1 P2 (5) 15627.1 0.7 -
4-2 R2 (1) 15627.3 0 56
4-2 R1 (0) 15650.7 0.2 188
3-1 P1 (5) 15652.7 1.6 -
4-2 R2 (0) 15698.2 0.2 41
3-1 P2 (6) 15756 1 8
O2 - - 15800 - 5
4-2 Q2 (1) 15826 0 84.5
4-2 Q1 (1) 15828.9 0 253.5
4-2 Q2 (2) 15838.2 0.1 23
4-2 Q1 (2) 15843.7 0.1 69
4-2 Q2 (3) 15858.2 0 7.25
4-2 Q1 (3) 15865 0.2 21.75
4-2 Q2 (4) 15885.7 0 1.25
4-2 Q1 (4) 15892.9 0.3 3.75
4-2 P2 (1) 15968.2 0.3 100
4-2 P1 (1) 16026.4 0.3 299
4-2 P2 (2) 16075.4 0.1 125
4-2 P1 (2) 16124.2 0.6 296
4-2 P2 (3) 16190.2 0.1 61
4-2 P1 (3) 16230.9 1 297
5-3 R1 (5) 16265.9 0.6 2
5-3 R2 (5) 16275.3 0.6 1
5-3 R1 (4) 16297.8 0.6 14
5-3 R2 (4) 16311.1 0.5 5
4-2 P2 (4) 16312.7 0.4 72
5-3 R1 (3) 16337.3 0.6 56
4-2 P1 (4) 16346.8 1.3 138
5-3 R2 (3) 16355.9 0.4 24
5-3 R1 (2) 16384 0.5 51
5-3 R2 (2) 16410.2 0.2 16
5-3 R1 (1) 16437.7 0.4 174
4-2 P2 (5) 16443.1 0.7 19
4-2 P1 (5) 16472 1.7 20
5-3 R2 (1) 16474.6 0 63
5-3 R1 (0) 16497.9 0.2 152
5-3 R2 (0) 16549.3 0.2 92
4-2 P2 (6) 16581.8 1.1 3
4-2 P1 (6) 16606.5 2.1 20
5-3 Q2 (1) 16684.6 0.1 107.75
5-3 Q1 (1) 16687.8 0 323.25
5-3 Q2 (2) 16698.1 0.1 36
5-3 Q1 (2) 16704.3 0.1 108
5-3 Q2 (3) 16720.2 0.1 11.5
5-3 Q1 (3) 16727.9 0.2 34.5
5-3 Q2 (4) 16750.7 0 1.5
5-3 Q1 (4) 16759 0.3 4.5
5-3 P2 (1) 16835.9 0.3 71
5-3 P1 (1) 16899.1 0.4 244
5-3 P2 (2) 16950.4 0.1 122
5-3 P1 (2) 17004.1 0.7 301
5-3 P2 (3) 17073.7 0.1 82
5-3 P1 (3) 17119 1 199
5-3 P2 (4) 17205.6 0.4 60
5-3 P1 (4) 17243.9 1.4 107
6-4 R1 (3) 17278.1 0.6 47
6-4 R2 (3) 17298.6 0.4 12
6-4 R1 (2) 17326.1 0.5 58
5-3 P2 (5) 17346.4 0.7 53
6-4 R2 (2) 17354.9 0.2 42
5-3 P1 (5) 17379.1 1.8 60
6-4 R1 (1) 17381.9 0.4 126
6-4 R2 (1) 17422.3 0 45
6-4 R1 (0) 17445.2 0.2 160
5-3 P2 (6) 17496.4 1.1 9
6-4 R2 (0) 17501.1 0.2 55
5-3 P1 (6) 17524.6 2.2 28
6-4 Q2 (1) 17645 0.1 90.75
6-4 Q1 (1) 17648.4 0 272.25
6-4 Q2 (2) 17660 0.1 32.5
6-4 Q1 (2) 17667 0.1 97.5
6-4 Q2 (3) 17684.8 0.1 13
6-4 Q1 (3) 17693.6 0.2 39
6-4 Q2 (4) 17719 0 0.75
6-4 Q1 (4) 17728.6 0.3 2.25
6-4 P2 (1) 17806.6 0.3 72
6-4 P1 (1) 17875.4 0.4 268
6-4 P1 (2) 17989 0.7 204
6-4 P2 (3) 18063 0.1 12
6-4 P1 (3) 18113.5 1.1 27
8-6 R1 (5) 19523.3 0.4 14
7-5 P1 (5) 19555.7 2.1 10
8-6 R1 (3) 19588.1 0.5 6
8-6 R1 (2) 19637.1 0.5 18
8-6 R2 (2) 19672.6 0.3 7
8-6 R1 (1) 19696.7 0.4 32
8-6 R2 (1) 19746.1 0.1 10
8-6 R1 (0) 19766.5 0.2 46
8-6 R2 (0) 19834.3 0.2 15
8-6 Q2 (1) 19999.5 0.1 23.25
8-6 Q1 (1) 20002.7 0 69.75
8-6 Q2 (2) 20019.4 0.2 7
8-6 Q1 (2) 20027.7 0.1 21
8-6 Q2 (3) 20052.1 0.2 1.25
8-6 Q1 (3) 20063.5 0.2 3.75