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We give results of a low-resolution optical spectroscopic study of the brightnebulous stars conforming the tight stellar trapezium embedded inIRAS06548-0815, of the exciting star of IRAS06547-0810, and of the starsassociated with reflection nebulae (R-or N-stars) NJ065703.0-081421,NJ065714.1-081016, IRAS06548-0815 D and IRAS06548-0815 G, all objects scarcelyobserved and apparently pertaining to the dark cloud LDN 1655. Our resultsgiven here combined with the corresponding 2MASS near infrared photometryenables us to estimate a photometric distance to LDN1655 of 1.9 kpc and tolocate the trapezium stars on the (log Lstar/Lsun, logTeff) or HR diagram in anattempt to disclose about their true nature. The spectroscopy of IRAS06548-0815revealed two classic T Tauri, two Herbig Ae/Be stars, four weak-line T Tauristars, and two probable lithium-rich stars. Additionally, we found that theR-star IRAS06547-0810 is excited by a single B1(V) star, that IRAS06548-0815 Dis excited by a SpT. B2/B3(V) star, NJ065703.0-081421 and NJ065714.1-081016 areexcited by a B3/B4(V) emission star and an A6(V) star, respectively. Thebrightest near infrared source of the trapezium, IRS1, has an infraredluminosity comparable to a highly reddened O8(V) star (Av of 29m). The secondbrightest near infrared source of the trapezium, IRAS06548-0815 C is,optically, a single classical T Tauri star of spectral type K4/K5, but is aresolved binary in the 2MASSKs band, both components being of about the samebrightness.

PMS and ZAMS stars associated with the dark cloud LDN 1655