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- W2093562129 abstract "We report new spectral types or spectral classification constraints for over 600 stars in the Orion Nebula Cluster (ONC) based on medium resolution R~ 1500-2000 red optical spectra acquired using the Palomar 200 and Kitt Peak 3.5m telescopes. Spectral types were initially estimated for F, G, and early K stars from atomic line indices while for late K and M stars, constituting the majority of our sample, indices involving TiO and VO bands were used. To ensure proper classification, particularly for reddened, veiled, or nebula-contaminated stars, all spectra were then visually examined for type verification or refinement. We provide an updated spectral type table that supersedes Hillenbrand (1997), increasing the percentage of optically visible ONC stars with spectral type information from 68% to 90%. However, for many objects, repeated observations have failed to yield spectral types primarily due to the challenges of adequate sky subtraction against a bright and spatially variable nebular background. The scatter between our new and our previously determined spectral types is approximately 2 spectral sub-classes. We also compare our grating spectroscopy results with classification based on narrow-band TiO filter photometry from Da Rio et al. (2012, finding similar scatter. While the challenges of working in the ONC may explain much of the spread, we highlight several stars showing significant and unexplained bona fide spectral variations in observations taken several years apart; these and similar cases could be due to a combination of accretion and extinction changes. Finally, nearly 20% of ONC stars exhibit obvious Ca II triplet emission indicative of strong accretion." @default.
- W2093562129 created "2016-06-24" @default.
- W2093562129 creator A5013321503 @default.
- W2093562129 creator A5021903490 @default.
- W2093562129 creator A5041173852 @default.
- W2093562129 date "2013-09-05" @default.
- W2093562129 modified "2023-10-01" @default.
- W2093562129 title "AN ENHANCED SPECTROSCOPIC CENSUS OF THE ORION NEBULA CLUSTER" @default.
- W2093562129 cites W1611827953 @default.
- W2093562129 cites W1829490738 @default.
- W2093562129 cites W1966136987 @default.
- W2093562129 cites W1968836868 @default.
- W2093562129 cites W1969908235 @default.
- W2093562129 cites W1970076709 @default.
- W2093562129 cites W1975569707 @default.
- W2093562129 cites W1976083405 @default.
- W2093562129 cites W1976394168 @default.
- W2093562129 cites W1977237503 @default.
- W2093562129 cites W1982254412 @default.
- W2093562129 cites W1983121380 @default.
- W2093562129 cites W1983993499 @default.
- W2093562129 cites W1986666025 @default.
- W2093562129 cites W1986743369 @default.
- W2093562129 cites W1988434451 @default.
- W2093562129 cites W1993015167 @default.
- W2093562129 cites W1995719370 @default.
- W2093562129 cites W1996151206 @default.
- W2093562129 cites W1999304818 @default.
- W2093562129 cites W2000360385 @default.
- W2093562129 cites W2000566616 @default.
- W2093562129 cites W2002554847 @default.
- W2093562129 cites W2003334784 @default.
- W2093562129 cites W2006117995 @default.
- W2093562129 cites W2006831051 @default.
- W2093562129 cites W2008069977 @default.
- W2093562129 cites W2008318720 @default.
- W2093562129 cites W2011759989 @default.
- W2093562129 cites W2013305727 @default.
- W2093562129 cites W2020604761 @default.
- W2093562129 cites W2020711837 @default.
- W2093562129 cites W2021272563 @default.
- W2093562129 cites W2023959676 @default.
- W2093562129 cites W2027027121 @default.
- W2093562129 cites W2028763537 @default.
- W2093562129 cites W2031706247 @default.
- W2093562129 cites W2042848233 @default.
- W2093562129 cites W2048434302 @default.
- W2093562129 cites W2050362456 @default.
- W2093562129 cites W2051228165 @default.
- W2093562129 cites W2055506692 @default.
- W2093562129 cites W2057442093 @default.
- W2093562129 cites W2060678600 @default.
- W2093562129 cites W2060949467 @default.
- W2093562129 cites W2062705080 @default.
- W2093562129 cites W2067166560 @default.
- W2093562129 cites W2067324651 @default.
- W2093562129 cites W2071437263 @default.
- W2093562129 cites W2075237645 @default.
- W2093562129 cites W2075768010 @default.
- W2093562129 cites W2078092500 @default.
- W2093562129 cites W2080538197 @default.
- W2093562129 cites W2089880545 @default.
- W2093562129 cites W2090011728 @default.
- W2093562129 cites W2090469867 @default.
- W2093562129 cites W2091407898 @default.
- W2093562129 cites W2097456486 @default.
- W2093562129 cites W2098460545 @default.
- W2093562129 cites W2107028611 @default.
- W2093562129 cites W2108982802 @default.
- W2093562129 cites W2110816427 @default.
- W2093562129 cites W2122702239 @default.
- W2093562129 cites W2124675836 @default.
- W2093562129 cites W2125941734 @default.
- W2093562129 cites W2128204973 @default.
- W2093562129 cites W2138449805 @default.
- W2093562129 cites W2141287942 @default.
- W2093562129 cites W2144403351 @default.
- W2093562129 cites W2148165343 @default.
- W2093562129 cites W2150387380 @default.
- W2093562129 cites W2162810728 @default.
- W2093562129 cites W2166101527 @default.
- W2093562129 cites W2276552634 @default.
- W2093562129 cites W3100794176 @default.
- W2093562129 cites W3100985802 @default.
- W2093562129 cites W3100986175 @default.
- W2093562129 cites W3101534675 @default.
- W2093562129 cites W3102124664 @default.
- W2093562129 cites W3102659430 @default.
- W2093562129 cites W3104190350 @default.
- W2093562129 cites W3104446306 @default.
- W2093562129 cites W3104982668 @default.
- W2093562129 cites W3105034950 @default.
- W2093562129 cites W3105180545 @default.
- W2093562129 cites W3105515114 @default.
- W2093562129 cites W3106351454 @default.
- W2093562129 cites W3122088237 @default.
- W2093562129 cites W3123259393 @default.
- W2093562129 cites W4298857425 @default.