SIMBAD references

1994A&AS..104..169P - Astron. Astrophys., Suppl. Ser., 104, 169-177 (1994/April-1)

A near infrared survey of northern planetary nebulae.


Abstract (from CDS):

We have observed 77 evolved planetary nebulae in the J, H, K, L', and M photometric bands. As a consequence, we note that most PN fall into a range -0.6 < (J-H)0 < 0.2 mag , and 0.0 < (H-K)0 < 1.2mag , whilst a few sources have also been detected in the range 1.0 < (K-L)0 < 5.3 mag . Most indices (J-H)0 are almost certainly depressed through the influence of HeI 23 S 23 P emission, whilst stellar continua appear to dominate ∼ 6 sources, and components of high temperature dust enhance (J-H)0 in several others. Fully 60% of sources having (J-H)0 ≥0.0 appear to be type I nebulae. Finally, we note that H2S(1) and Q band quadrupole emission may be important in enhancing K band fluxes for several of the nebulae, and the mean value (H-K)0 ≃ 0.88 mag for H2S(1) emission sources is significantly in excess of the mean. As a consequence, the parameter (H-K)0 may prove a useful tool in the prior selection of nebulae having shocked, neutral gas. By contrast, the various L' band detections are likely to derive from a mix of mechanisms, including emission from grains having a broad range of temperatures.

Abstract Copyright:

Journal keyword(s): planetary nebulae: general - infrared: insterstellar: continuum, lines - surveys

VizieR on-line data: <Available at CDS (J/A+AS/104/169): table1>

Simbad objects: 77

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