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All Journal Jurnal Matematika & Sains Journal of Mathematical and Fundamental Sciences JFA (Jurnal Fisika dan Aplikasinya) PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Jurnal Medika Veterinaria
Aprilia Wardana
Institut Teknologi Bandung
Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemistry Earth & Planetary Sciences Electrical & Electronics Engineering Energy Immunology & microbiology Mathematics Medicine & Pharmacology Physics Veterinary Other

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Database and Animation Package of Stellar Evolution Study Mahaseana Putra; Muhamad Irfan Hakim; Aprilia Wardana; Winardi Sutantyo
Jurnal Matematika & Sains Vol 11, No 3 (2006)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The study of stellar evolution is an active major branch in astrophysics. Results from stellar evolution studies are indispensable for studies in some other areas such as chemical evolution of star clusters and galaxies. Recently theoretical/computational studies of stellar evolution often involve large populations of stars (~106) which need databases of evolution tracks with various realistic parameters (mass, chemical composition, etc). In this paper, an attempt in building such a database and construction of animations of the evolution of stellar internal structures and isochrones which is useful in teaching stellar evolution were described.
B-emission Stars in Southern Sky Observed in Bosscha Observatory: Spectroscopic Study of Hα Spectral Line Variability Aprilia Aprilia; Hakim Luthfi Malasan; Geavani Eva Ramadhania; Agus Triono Puri Jatmiko; Mochamad Irfan; Dhimaz Gilang Ramadhan; Ade Nur Istiqomah; Evan Irawan Akbar
Journal of Mathematical and Fundamental Sciences Vol. 51 No. 3 (2019)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.math.fund.sci.2019.51.3.3

Abstract

Hα line variations of 8 B-emission (Be) stars are presented. Stars that are listed in the Bright Star Catalogue were observed in 2009 at the Bosscha Observatory, Lembang, Indonesia. It was found that 4 stars showed phase changing from Be double-peaked to Be single-peaked emission line profiles, 1 showed single-peaked to double-peaked profiles, 1 showed double-peaked to B-normal, while two other stars did not show phase changing. The stars also showed variations in the V/R and E/C values, which represent the strength of the emission lines. The phase changes were detected from a comparison of the observed data to the current data in the BeSS database.
STUDI SPEKTROSKOPI PADA GARIS EMISI BETA LYRAE Robiatul Muztaba; Aprilia Aprilia; Hakim L. Malasan
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 7 (2018): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2018
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (803.322 KB) | DOI: 10.21009/03.SNF2018.02.PA.09

Abstract

Abstrak Telah dilakukan studi mengenai pembentukan garis emisi pada Beta Lyrae. Beta Lyrae menjadi objek penelitian yang menarik selama 200 tahun terakhir dari berbagai metode pengamatan sinar-X, UV, optic, radio, dan inframerah. Kami memaparkan hasil pengamatan spektroskopi Beta Lyrae menggunakan spektrograf NEO R-1000 yang dipasang pada teleskop C-11 di Observatorium Bosscha. Pengamatan dilakukan selama bulan Agustus hingga September pada tahun 2015. Hasil pengamatan spektroskopi Beta Lyrae juga dibandingkan dengan data dari BeSS untuk melihat variasi perubahan spektrumnya terhadap waktu. Kemunculan profil garis invers P-Cygni pada panjang gelombang He I 5876 menjadi salah satu kasus yang menarik pada Beta Lyrae. Kami menduga bahwa profil invers P-Cygni dalam tahap evolusi spektrum sebelumnya berupa profil P-Cygni. Perubahan spektrum profil P-Cygni menjadi invers P-Cygni mengindikasikan bahwa keadaan lapisan gas terluar yang tidak stabil secara dinamik akibat proses transfer massa atau terjadi perubahan kecepatan rotasi yang berdampak pada perubahan laju kehilangan massa. Selain itu, juga terdapat fitur garis emisi yang kuat di panjang gelombang Hα λ 6563. Puncak profil garis Hα tersebut mengalami pergeseran panjang gelombang. Pergeseran garis dapat mengindikasikan adanya efek tekanan atau akibat dari ejeksi lapisan bintang. Kata-kata kunci: Beta Lyrae, Garis Emisi, Spektroskopi, P-Cygni. Abstract A study has been conducted on the formation of an emission line in Beta Lyrae. Beta Lyrae has been a fascinating object of research over the past 200 years from various observational methods such as X-ray, UV, optic, radio, and infrared. We presented Beta Lyrae spectroscopic observations using the NEO R-1000 spectrograph mounted on the C-11 telescope at the Bosscha Observatory. Observations were made during August to September in 2015. The results of spectroscopic observations of Beta Lyrae is also compared with data from Bess to see the variation of the spectrum changes over time. The appearance of the P-Cygni inverse line profile at He I 5876 wavelength became one of the interesting cases on Beta Lyrae. We suspect that P-Cygni's inverse profile in the previous spectrum evolution stage is a P-Cygni profile. Changing the P-Cygni profile spectrum to P-Cygni inverse indicates that the state of the outermost layer of the unstable gas dynamically due to mass transfer or rotational velocity changes affecting the change in mass loss rate. In addition, there is also a feature of a strong emission line at the wavelength of Hα λ 6563. The peak profile of the Hα line undergoes a wavelength shift. The shift line may indicate the effect of pressure or as a result of ejection layers of the star. Keywords: Beta Lyrae, Emission Line, Spectroscopy, P-Cygni.
The Metallicity of the Sun Reviewed from Pre-Main Sequence Evolution Putri Indriani; Aprilia Aprilia
Jurnal Fisika dan Aplikasinya Vol 18, No 3 (2022)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v18i3.12791

Abstract

Metallicity is defined as the fraction of the abundance of elements heavier than hydrogen and helium. Metallicity has different values for different stellar objects and its value will also change as the star evolves. This research is focused on calculating and analyzing the early metallicity of the Sun, that is at the beginning of the Sun's evolution at the Pre-Main Sequence. Five metallicity samples with an initial mass of 1 M⊙ were used. This study uses the evolution code MESA r-15140 which produces a Hertzsprung-Russell diagram with various metallicities. From the simulation, it is found that the most suitable metallicity is 0.065. There are four dominant elements at the core of the Sun, namely hydrogen, helium, carbon, and oxygen. The density, pressure, and temperature values at the core of the Sun also increase with age.
TINGKAT PARASITEMIA MENCIT PUTIH (Mus musculus L.) JANTAN GALUR DDY DIINFEKSI Trypanosoma evansi ISOLAT PIDIE DAN PEMALANG (Parasitemia Level of Male White Mice (Mus musculus L.) DDY Strain Infected with Trypanosoma evansi of Pidie and Pemalang Isolate) Febiola Rama Sari; Yudha Fahrimal; Ummu Balqis; Aprilia Wardana; Muhammad Hambal
Jurnal Medika Veterinaria Vol 9, No 2 (2015): J. Med. Vet.
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21157/j.med.vet..v9i2.3947

Abstract

This study aimed to observe parasitemia of DDY white mice infected with T. evansi of Pidie and Pemalang isolates obtained from Balai Besar Penelitian Veteriner (BBPV) Bogor. Twelve DDY mice were divided into 3 groups, each group consisted of 4 mice. Mice in the first group were not treated with any treatment. The second group was inoculated with 104 T. evansi Pidie isolate and the third group was inoculated with 104 T. evansi of Pemalang isolate. Mice blood were collected every two days from tail vein for parasitemia examination. Parasitemia examination was conducted until all mice die. The results indicate that there was difference in parasitemia level between the two isolates. Parasitemia of mice infected with Pidie isolate characterized by rapid rise of parasitemia in blood (107-108/mL of blood) in a short time (2-4 days) since first parasitemia was detected and followed by death at day 4. While the parasitemia of mice infected with Pemalang isolate increased in the blood (108-109/mL of blood) on day 4 and maintained for a few more days and then fluctuated for a few more days before the animal died.Key words: Trypanosoma evansi, parasitemia, Pidie isolate, Pemalang isolate
The Metallicity of the Sun Reviewed from Pre-Main Sequence Evolution: Putri Indriani, Aprilia Aprilia Putri Indriani Putri Indriani; Aprilia Aprilia
Jurnal Fisika dan Aplikasinya Vol 18 No 3 (2022): October 2022 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v18i3.12791

Abstract

Metallicity is defined as the fraction of the abundance of elements heavier than hydrogen and helium. Metallicity has different values for different stellar objects and its value will also change as the star evolves. This research is focused on calculating and analyzing the early metallicity of the Sun, that is at the beginning of the Sun's evolution at the Pre-Main Sequence. Five metallicity samples with an initial mass of 1 Mo were used. This study uses the evolution code MESA r-15140 which produces a Hertzsprung-Russell diagram with various metallicities. From the simulation, it is found that the most suitable metallicity is 0.065. There are four dominant elements at the core of the Sun, namely hydrogen, helium, carbon, and oxygen. The density, pressure, and temperature values at the core of the Sun also increase with age.
Co-Authors Ade Nur Istiqomah Agus Triono Puri Jatmiko Akbar, Evan Irawan Dhimaz Gilang Ramadhan Febiola Rama Sari Geavani Eva Ramadhania Hakim L. Malasan Hakim Luthfi Malasan Mahaseana Putra Mochamad Irfan Muhamad Irfan Hakim Muhammad Hambal Putri Indriani Putri Indriani Putri Indriani Robiatul Muztaba Ummu Balqis Winardi Sutantyo Yudha Fahrimal