Results 21 to 30 of about 281 (168)
OUTFLOW, INFALL, AND PROTOSTARS IN THE STAR-FORMING CORE W3-SE [PDF]
The Astrophysical Journal, 2011 We report new results on outflow and infall in the star forming cores W3-SE SMA-1 and SMA-2 based on analysis of $\sim2.5\arcsec$ resolution observations of the molecular lines HCN(3-2), HCO$^+$(3-2), N$_2$H$^+$(3-2) and CH$_3$OH(5$_{2,3}-4_{1,3}$) with the Submillimeter Array. A high-velocity bipolar outflow originating from the proto-stellar core SMA-
Zhu, Lei +2 more
openaire +4 more sources
Constraints on star formation from the close packing of protostars in clusters [PDF]
Monthly Notices of the Royal Astronomical Society, 2003 in press for MNRAS, 5 ...
Elmegreen, Bruce G., Shadmehri, Mohsen
openaire +2 more sources
Magnetohydrodynamic effect on first star formation: pre-stellar core collapse and protostar formation [PDF]
Monthly Notices of the Royal Astronomical Society, 2021 ABSTRACT Recent theoretical studies have suggested that a magnetic field may play a crucial role in the first star formation in the universe. However, the influence of the magnetic field on the first star formation has yet to be understood well.
Kenji Eric Sadanari +4 more
openaire +2 more sources
International Journal of Chemical Kinetics, Volume 55, Issue 11, Page 731-742, November 2023., 2023 Abstract The kinetics of the tautomerization of thio‐imidic acids RC(SH)NH were determined at low (50–300 K) and high (500–1500 K) temperatures as R was varied to encompass mono‐ and diatomic species H, F, HO, NC, CN through H2N, HC(O), HC(S), HC≡ C, H3C, F3C, HOCH2, H2C=CH, CH3C(O), H2NCH2 and including ethyl, isopropyl and phenyl groups. The presence
Judith Würmel, John M. Simmie
wiley +1 more source
Meteoritics &Planetary Science, Volume 58, Issue 9, Page 1365-1381, September 2023., 2023 Abstract The origin and transport of water in the early Solar System is an important topic in both astrophysics and planetary science, with applications to protosolar disk evolution, planetary formation, and astrobiology. Of particular interest for understanding primordial water transport are the unequilibrated ordinary chondrites (UOCs), which have ...
Helen Grant +6 more
wiley +1 more source
STAR FORMATION NEAR BERKELEY 59: EMBEDDED PROTOSTARS [PDF]
The Astronomical Journal, 2013 A group of suspected protostars in a dark cloud northwest of the young (~2 Myr) cluster Berkeley 59 and two sources in a pillar south of the cluster have been studied in order to determine their evolutionary stages and ascertain whether their formation was triggered by Berkeley 59.
Majaess, Daniel J., Rosvick, J. M.
openaire +1 more source
Loading of Amino Acids onto RNA in a Putative RNA‐Peptide World
Angewandte Chemie International Edition, Volume 62, Issue 21, May 15, 2023., 2023 The loading of RNAs with amino acids constitutes the first step toward RNA‐based peptide synthesis in a putative prebiotic RNA‐peptide world. The efficient loading of RNA strands incorporating N‐methylcarbamoyl nucleotides with a series of amino acids is reported. The loaded RNA strands also underwent RNA‐based amino acid transfer reactions.
Johannes N. Singer +7 more
wiley +1 more source
The grain size distribution of matrix in primitive chondrites
Meteoritics &Planetary Science, Volume 58, Issue 5, Page 688-704, May 2023., 2023 Abstract The matrix of primitive chondrites is composed of submicron crystals embedded in amorphous silicates. These grains are thought to be the remains of relatively unprocessed dust from the inner regions of the protoplanetary disk. The matrix of primitive meteorites is often compared to chondritic porous interplanetary dust particles (CP‐IDPs ...
E. Vaccaro +4 more
wiley +1 more source
YOUNG STELLAR POPULATIONS IN MYStIX STAR-FORMING REGIONS: CANDIDATE PROTOSTARS [PDF]
The Astrophysical Journal, 2016 ABSTRACT The Massive Young Star-Forming Complex in Infrared and X-ray (MYStIX) project provides a new census on stellar members of massive star-forming regions within 4 kpc. Here the MYStIX Infrared Excess catalog and Chandra-based X-ray photometric catalogs are mined to obtain high-quality samples of Class I protostars using criteria ...
Gregory Romine +4 more
openaire +2 more sources
Lifetime of the Outer Solar System Nebula From Carbonaceous Chondrites
Journal of Geophysical Research: Planets, Volume 127, Issue 7, July 2022., 2022 Abstract The evolution and lifetime of protoplanetary disks (PPDs) play a central role in the formation and architecture of planetary systems. Astronomical observations suggest that PPDs evolve in two timescales, accreting onto the star for up to several million years (Myr) followed by gas dissipation within ≲1 Myr. Because solar nebula magnetic fields
Cauê S. Borlina +3 more
wiley +1 more source